---
title: "Pen Needles 31g 8mm — $350K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/pen-needles-31g-8mm"
last_updated: "2026-08-11T22:13:20.108Z"
locale: en
meta:
description: "Niche score 62/100 · $350K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 62/100 · $350K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Pen Needles 31g 8mm — $350K/yr Amazon US Niche (2026) - Flapen"
---
# **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 5% 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
**Signals**[** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, pen needles 31g 8mm is a $350K/yr Amazon United States market (95K searches/yr). The top 5 brands hold 70% of demand. Demand peaks in Feb–May. Verdict: Worth a look — 62/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **pen needles 31g 8mm market data**
- **Units sold / yr**
- **15K–20K**
- avg 250–500/product
- **Revenue / yr**
- **$337K–$450K**
- units × avg price
- **Conversion rate**
- **16.5%**
- **Avg BSR**
- **#552**
- **Page quality**
- **0%**
- **Prime**
- **83%**
- **Sponsored**
- **47%**
- **Out of stock**
- **20.0%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **183 days**
## **Competition & brand share**
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%**
Top 20: 100%
**Top-5 click share**
**51%**
Top 20: 90%
**Open market**
**23%**
- Medt30% - GLUCO-CARE13% - ONE-CARE11% - Pro Comfort9% - TRUEplus8% - Aicare7%
## **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×
[**Open Trend **](https://flapen.com/research/us/health-household/pen-needles-31g-8mm/trend)
## **Top pen needles 31g 8mm search terms**
- **pen needles 31g 8mm**33K/yr+14.4%12.3% conv. - **31g 8mm pen needles**13K/yr+74.7%9.2% conv. - **insulin pen needles 31g 8mm**14K/yr+49.5%9.9% conv. - **pen tips 31g x 8mm**5K/yr+147.3%10.3% conv. - **one care pen needles 31g 8mm**6K/yr+32.5%9.0% conv. - **8mm pen needles**6K/yr+84.5%11.5% conv. - **insulin pen needles 8mm**5K/yr+11.4%8.1% conv. - **pen needles 8mm**4K/yr+40.4%10.2% conv. - **ultra fine pen needles 31g 8mm**3K/yr+28.3%8.5% conv. - **bd ultra fine short 8mm 31g pen needles**6K/yr-55.6%6.8% conv. [**All search terms **](https://flapen.com/research/us/health-household/pen-needles-31g-8mm/search-terms)
## **Top pen needles 31g 8mm products on Amazon**
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 24 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**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)**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**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**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**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**ONE-CARE**$12.32**26 rev2mo ago](https://www.amazon.com/dp/B0H1F5WZQF) [**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**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**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**GLUCO-CARE**$11.74**19 rev3mo ago](https://www.amazon.com/dp/B0GWJB4937)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**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**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**TRUEplus**$9.99**4.6★**▲ 110%**](https://www.amazon.com/dp/B0GVGHQ6B6) [**31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable**Pro Comfort**$12.58**4.3★**▲ 110%**](https://www.amazon.com/dp/B0GZNM6GD6)
**~~View all trending →~~**
## **What buyers say about pen needles 31g 8mm**
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%
## **Common questions**
- **Is pen needles 31g 8mm profitable to sell on Amazon United States?**
- The niche generates $350K/yr across 30 tracked products. 10 of 14 products launched in the last 360 days are still selling. 90-day search growth is +35.4%. Flapen's verdict: Worth a look (62/100).
- **How competitive is the pen needles 31g 8mm niche?**
- 16 brands and 29 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 70% of demand.
- **What do buyers complain about in pen needles 31g 8mm?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Pain Relief-Overall. The return rate is 0.4%.
- **When does demand for pen needles 31g 8mm peak?**
- Demand peaks in Feb–May; the busiest month runs 9.5× the quietest.
- **What does it cost to enter the pen needles 31g 8mm niche?**
- Listings span $8.71–$299.35; the average listing price is $22.48 (sweet spot $15–$100). The average incumbent carries 1,300 reviews — the moat a new listing must climb.
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