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title: "pen needles 31g 8mm — Niche Verdict: Worth a look (62/100) | Amazon United States - Flapen"
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last_updated: "2026-07-14T01:33:03.186Z"
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  description: "pen needles 31g 8mm shows searches that convert (16.5% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:description": "pen needles 31g 8mm shows searches that convert (16.5% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:title": "pen needles 31g 8mm — Niche Verdict: Worth a look (62/100) | Amazon United States - Flapen"
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# **pen needles 31g 8mm**

**Worth a look**

Shows searches that convert (16.5% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 53Growth 60Conversion 98Competition 57Returns 98Price range 29Avg price 94Brand share 58Review moat 55Quality gap 23

**Conversion**

**Incredible****16.5%**

search→purchase rate — share of searches ending in a sale

**Returns**

**Incredible****0.4%**

return rate — above 6% kills the launch gate

**Avg price**

**Great****$22.48**

avg listing price — sweet spot $15–$100

**Growth**

**Good****+35.4%**

90-day search growth — must beat 0% to launch

**Brand share**

**Good****70%**

top-5 brand share — brands hold most of the demand

**Competition**

**Good****51%**

top-5 click share — leaders hold, buyers still browse

**Review moat**

**Good****1,300.47**

avg incumbent reviews — the moat a new listing must climb

**Market size**

**Good****$350K**

$350K/yr · 95K searches

**Price range**

**Okay****$8.71–$299.35**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

## **Competition**

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**16 **▲rising

**Sellers**

**29**

**Top-5 brand share**

**70%**

**Open market**

**23%**

- Medt30% - GLUCO-CARE13% - ONE-CARE11% - Pro Comfort9% - TRUEplus8% - Aicare7%

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%4%$14K8%$28K12%$42K16%$56K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 30 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Medt - Fine Insulin Pen Needles (31G 8 mm) Diabetic Needles for Insulin Injections Ultra Fine Compatible with Most Diabetes Pens - 100 Ct Pack of 2](https://m.media-amazon.com/images/I/41NZ4+KxZoL.jpg)**Medt - Fine Insulin Pen Needles (31G 8 mm) Diabetic Needles for Insulin Injections Ultra Fine Compatible with Most Diabetes Pens - 100 Ct Pack of 2**Medt**$15.20**4.8★6,583 rev](https://www.amazon.com/dp/B0DJ9SK9QM) [2![Medt Fine Insulin Pen Needles 31G 8mm - Ultra-Fine Diabetic Pen Needles Designed for Comfort Universal Fit for Most Pen-Style Devices Sterile Single-Use Pen Tips 100 Count (Pack of 1)](https://m.media-amazon.com/images/I/41f2KFLt+eL.jpg)**Medt Fine Insulin Pen Needles 31G 8mm - Ultra-Fine Diabetic Pen Needles Designed for Comfort Universal Fit for Most Pen-Style Devices Sterile Single-Use Pen Tips 100 Count (Pack of 1)**Medt**$8.71**4.8★6,583 rev](https://www.amazon.com/dp/B0DJ9RG5SR) [3![31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable](https://m.media-amazon.com/images/I/51b3ChjRdYL.jpg)**31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable**Pro Comfort**$12.58**4.3★27 rev](https://www.amazon.com/dp/B0GZNM6GD6) [4![GLUCO-CARE Pen Tips 31G x 8mm (5/16) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box](https://m.media-amazon.com/images/I/41upKhpDryL.jpg)**GLUCO-CARE Pen Tips 31G x 8mm (5/16) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box**GLUCO-CARE**$10.99**4.7★17 rev](https://www.amazon.com/dp/B0GWHTY427) [5![ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01](https://m.media-amazon.com/images/I/41v8M+-D-NL.jpg)**ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01**ONE-CARE**$12.32**4.4★26 rev](https://www.amazon.com/dp/B0H1F5WZQF)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01](https://m.media-amazon.com/images/I/41v8M+-D-NL.jpg)**ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01**ONE-CARE**$12.32**26 rev2mo ago](https://www.amazon.com/dp/B0H1F5WZQF) [![31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable](https://m.media-amazon.com/images/I/51b3ChjRdYL.jpg)**31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable**Pro Comfort**$12.58**27 rev2mo ago](https://www.amazon.com/dp/B0GZNM6GD6) [![31 Gauge 5/16 Inch/8mm Pen Accessories Pack of 200 Thin-Wall Channel Design Individually Wrapped](https://m.media-amazon.com/images/I/51G9g69c4wL.jpg)**31 Gauge 5/16 Inch/8mm Pen Accessories Pack of 200 Thin-Wall Channel Design Individually Wrapped**Pegmapri**$25.84**19 rev2mo ago](https://www.amazon.com/dp/B0GYRCZYTB) [![GLUCO-CARE Pen Tips 31G x 8mm (5/16) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box](https://m.media-amazon.com/images/I/41upKhpDryL.jpg)**GLUCO-CARE Pen Tips 31G x 8mm (5/16) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box**GLUCO-CARE**$10.99**17 rev3mo ago](https://www.amazon.com/dp/B0GWHTY427) [![GLUCO-CARE Pen Tips 31G x 6mm (1/4) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box](https://m.media-amazon.com/images/I/41jr80hiDpL.jpg)**GLUCO-CARE Pen Tips 31G x 6mm (1/4) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box**GLUCO-CARE**$11.74**19 rev3mo ago](https://www.amazon.com/dp/B0GWJB4937)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Pen Tips 31G x 4mm(5/32) Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count](https://m.media-amazon.com/images/I/51HJ8+YqOPL.jpg)**Pen Tips 31G x 4mm(5/32) Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.41**4.6★**▲ 111%**](https://www.amazon.com/dp/B0GR4YXQVR) [![iHome Pen Tips 31G x 8mm Universal Fit 100 Count Comfortable](https://m.media-amazon.com/images/I/51kEEXpDApL.jpg)**iHome Pen Tips 31G x 8mm Universal Fit 100 Count Comfortable**iHome**$10.24**4.8★**▲ 111%**](https://www.amazon.com/dp/B0GVCCV5H8) [![GLUCO-CARE Pen Tips 31G x 6mm (1/4) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box](https://m.media-amazon.com/images/I/41jr80hiDpL.jpg)**GLUCO-CARE Pen Tips 31G x 6mm (1/4) Ultra-Thin Tip Design Thin-Wall Channel Structure Universal Twist-On Connection 100 Count Box**GLUCO-CARE**$11.74**4.5★**▲ 111%**](https://www.amazon.com/dp/B0GWJB4937) [![ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01](https://m.media-amazon.com/images/I/41v8M+-D-NL.jpg)**ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01**ONE-CARE**$12.32**4.4★**▲ 110%**](https://www.amazon.com/dp/B0H1F5WZQF) [![TRUEplus 5-Bevel Sterile Pen Needles 31G x 8mm (5/16 Inch) Single-Use Needles Silicone Coated Compatible Thread with Major Pen Devices 50 Count](https://m.media-amazon.com/images/I/51Yswrb190L.jpg)**TRUEplus 5-Bevel Sterile Pen Needles 31G x 8mm (5/16 Inch) Single-Use Needles Silicone Coated Compatible Thread with Major Pen Devices 50 Count**TRUEplus**$9.99**4.6★**▲ 110%**](https://www.amazon.com/dp/B0GVGHQ6B6)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +35.4% search growth over the last 90 days.

10K6KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Feb, May · busiest ÷ quietest = 9.5×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Value For Money**22%

*“Good deal”*

**Quality-Overall**17%

*“Excellent Quality”*

**Size-Overall**12%

*“These fit like a glove and fit perfectly”*

**Ease Of Use**12%

*“easy to control”*

**Advertised Vs Actual Product**7%

*“Works as advertised”*

**Comfort-Overall**5%

*“They are comfortable”*

**Efficiency**4%

*“These pen needles work well”*

**Sharpness**3%

*“Nice and sharp”*

**Leak-Proof**2%

*“They are individually sealed”*

**Design-Overall**2%

*“The universal twist-on design works perfectly”*

### **What buyers complain about **

**Size-Overall**14%

*“Tiny”*

**Quality-Overall**8%

*“I've noticed the quality is very inconsistent”*

**Pain Relief-Overall**8%

*“Dull and painful”*

**Sharpness**6%

*“these needles definitely don't appear to be as sharp”*

**Thickness**5%

*“meaning they are slightly thicker than the 32G I am used to”*

**Flexibility**4%

*“bend more easily than some others”*

**Strength**3%

*“Needles are very weak”*

**Value For Money**3%

*“found the price went up twice the original”*

**Ease Of Use**3%

*“I hardly feel them during use”*

**Comfort-Overall**2%

*“which was also uncomfortable”*

### **Top return reasons **

**Size-Overall**49%

**Advertised Vs Actual Product**18%

**Compatibility-Overall**9%

**Functionality-Overall**5%

**Value For Money**3%

**Leak-Proof**2%

**Quality-Overall**2%

**Joint Pain**1%

**Thickness**1%

**Pain Relief-Overall**1%