---
title: "pen needles 31g 5mm — Niche Verdict: Worth a look (55/100) | Amazon United States - Flapen"
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last_updated: "2026-07-14T00:27:17.209Z"
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  description: "pen needles 31g 5mm shows low returns (0.1%), but strong incumbent ratings (4.7★) keeps it on the watch list."
  "og:description": "pen needles 31g 5mm shows low returns (0.1%), but strong incumbent ratings (4.7★) keeps it on the watch list."
  "og:title": "pen needles 31g 5mm — Niche Verdict: Worth a look (55/100) | Amazon United States - Flapen"
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# **pen needles 31g 5mm**

**Worth a look**

Shows low returns (0.1%), but strong incumbent ratings (4.7★) keeps it on the watch list.

Market size 37Growth 33Conversion 97Competition 46Returns 99Price range 83Avg price 82Brand share 48Review moat 64Quality gap 21

**Returns**

**Incredible****0.1%**

return rate — above 6% kills the launch gate

**Conversion**

**Incredible****15.7%**

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

**Price range**

**Great****$8.60–$50.25**

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

**Avg price**

**Great****$17.64**

avg listing price — sweet spot $15–$100

**Review moat**

**Good****946**

avg incumbent reviews — the moat a new listing must climb

**Brand share**

**Okay****76%**

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

**Competition**

**Okay****57%**

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

**Market size**

**Okay****$186K**

$186K/yr · 67K searches

**Growth**

**Okay****+6.2%**

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

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

## **Competition**

The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**12 **▲rising

**Sellers**

**16**

**Top-5 brand share**

**76%**

**Open market**

**18%**

- Medt35% - GLUCO-CARE16% - Sensifine10% - Pro Comfort9% - Pharmacy Choice7% - Aicare5%

## **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%10%$19K20%$37K30%$56K40%$75K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 21 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 5mm - 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/41MueoRHMjL.jpg)**Medt Fine Insulin Pen Needles 31G 5mm - 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**$8.61**4.8★5,065 rev](https://www.amazon.com/dp/B0DJ9T6C92) [2![GLUCO-CARE Pen Tips 31G x 5mm Universal Fit and Twist-On Design Thin Wall Compatible with Most Pen Devices 100 Pieces per Box](https://m.media-amazon.com/images/I/41LAP3g68pL.jpg)**GLUCO-CARE Pen Tips 31G x 5mm Universal Fit and Twist-On Design Thin Wall Compatible with Most Pen Devices 100 Pieces per Box**GLUCO-CARE**$10.30**4.7★292 rev](https://www.amazon.com/dp/B0DL51WSYJ) [3![31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design](https://m.media-amazon.com/images/I/51EmXozkqXL.jpg)**31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design**Pro Comfort**$12.23**4.6★46 rev](https://www.amazon.com/dp/B0GYD7FJFJ) [4![Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices](https://m.media-amazon.com/images/I/31SEgXKIyoL.jpg)**Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices**Sensifine**$16.00**4.9★45 rev](https://www.amazon.com/dp/B0GH7CVPPD) [5![Medt - Fine Insulin Pen Needles (31G 5mm) - Diabetic Needles for Insulin Injections Ultra Fine Compatible with Most Diabetes Pens - 100 Ct Pack of 2](https://m.media-amazon.com/images/I/41xC25rN0tL.jpg)**Medt - Fine Insulin Pen Needles (31G 5mm) - Diabetic Needles for Insulin Injections Ultra Fine Compatible with Most Diabetes Pens - 100 Ct Pack of 2**Medt**$15.96**4.8★5,065 rev](https://www.amazon.com/dp/B07HB7N8ZJ)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design](https://m.media-amazon.com/images/I/51EmXozkqXL.jpg)**31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design**Pro Comfort**$12.23**46 rev2mo ago](https://www.amazon.com/dp/B0GYD7FJFJ) [![Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use](https://m.media-amazon.com/images/I/51Y4f9bRguL.jpg)**Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use**Suqaoae**$26.47**13 rev2mo ago](https://www.amazon.com/dp/B0GXK81LLQ) [![BD Ultra-Fine Mini Pen Tips 31G x 5mm 90 Count](https://m.media-amazon.com/images/I/31E-Y-B4tCL.jpg)**BD Ultra-Fine Mini Pen Tips 31G x 5mm 90 Count**Generic**$50.25**0 rev3mo ago](https://www.amazon.com/dp/B0H2BVMFZB) [![31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count](https://m.media-amazon.com/images/I/51wPhM7nM8L.jpg)**31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.07**25 rev4mo ago](https://www.amazon.com/dp/B0GRV6KVZD) [![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**31 rev4mo ago](https://www.amazon.com/dp/B0GR4YXQVR)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use](https://m.media-amazon.com/images/I/51Y4f9bRguL.jpg)**Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use**Suqaoae**$26.47**4.8★**▲ 132%**](https://www.amazon.com/dp/B0GXK81LLQ) [![31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design](https://m.media-amazon.com/images/I/51EmXozkqXL.jpg)**31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design**Pro Comfort**$12.23**4.6★**▲ 132%**](https://www.amazon.com/dp/B0GYD7FJFJ) [![31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count](https://m.media-amazon.com/images/I/51wPhM7nM8L.jpg)**31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count**Pharmacy Choice**$10.07**4.8★**▲ 131%**](https://www.amazon.com/dp/B0GRV6KVZD) [![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★**▲ 131%**](https://www.amazon.com/dp/B0GR4YXQVR) [![Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices](https://m.media-amazon.com/images/I/31SEgXKIyoL.jpg)**Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices**Sensifine**$16.00**4.9★**▲ 131%**](https://www.amazon.com/dp/B0GH7CVPPD)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — +6.2% search growth over the last 90 days.

2K1KHoliday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: May · busiest ÷ quietest = 1.7×

## **Reviews**

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

### **What buyers love **

**Value For Money**23%

*“Great deal”*

**Quality-Overall**15%

*“Overall build quality is consistent”*

**Ease Of Use**11%

*“easy to open”*

**Size-Overall**11%

*“fit securely”*

**Advertised Vs Actual Product**7%

*“Item as described”*

**Comfort-Overall**5%

*“Extremely comfortable”*

**Compatibility-Overall**3%

*“Designed with universal fit compatibility”*

**Sharpness**3%

*“Great pen tips-sharp”*

**Efficiency**3%

*“performed well in everyday use”*

**Leak-Proof**2%

*“doesnt leak out”*

### **What buyers complain about **

**Size-Overall**12%

*“But got the wrong size”*

**Pain Relief-Overall**6%

*“There is more discomfort initially”*

**Thickness**5%

*“They are super thin”*

**Comfort-Overall**3%

*“Lower quality needles can be quite uncomfortable”*

**Value For Money**3%

*“much cheaper”*

**Quality-Overall**3%

*“they didn't have enough quality control to identify”*

**Jamming/Clogging**3%

*“Some are clogged up & don't work”*

**Functionality-Overall**3%

*“do not work”*

**Ease Of Use**2%

*“it takes a little more effort and time”*

**Blood Sugar Level**2%

*“In fact I can barely even feel it when I'm administering my insulin”*

### **Top return reasons **

**Size-Overall**42%

**Compatibility-Overall**18%

**Advertised Vs Actual Product**10%

**Functionality-Overall**8%

**Design-Overall**2%

**Safety Standards**2%

**Comfort-Overall**2%

**Leak-Proof**2%

**Shape/Style**1%

**Quality-Overall**1%