pen needles 31g 8mm
Worth a lookShows searches that convert (16.5% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Conversion
Incredible16.5%search→purchase rate — share of searches ending in a sale
Returns
Incredible0.4%return rate — above 5% kills the launch gate
Avg price
Great$22.48avg listing price — sweet spot $15–$100
Growth
Good+35.4%90-day search growth — must beat 0% to launch
Brand share
Good70%top-5 brand share — brands hold most of the demand
Competition
Good51%top-5 click share — leaders hold, buyers still browse
Review moat
Good1,300.47avg incumbent reviews — the moat a new listing must climb
Market size
Good$350K$350K/yr · 95K searches
Price range
Okay$8.71–$299.35cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
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
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.Peak months: Feb, May · busiest ÷ quietest = 9.5×
Top pen needles 31g 8mm search terms
- pen needles 31g 8mm33K/yr
- 31g 8mm pen needles13K/yr
- insulin pen needles 31g 8mm14K/yr
- pen tips 31g x 8mm5K/yr
- one care pen needles 31g 8mm6K/yr
- 8mm pen needles6K/yr
- insulin pen needles 8mm5K/yr
- pen needles 8mm4K/yr
- ultra fine pen needles 31g 8mm3K/yr
- bd ultra fine short 8mm 31g pen needles6K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$15.204.8★6,583 rev
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$8.714.8★6,583 rev
31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable
Pro Comfort$12.584.3★27 rev
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$10.994.7★17 rev
ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01
ONE-CARE$12.324.4★26 rev
Newest
by launch dateONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01
ONE-CARE$12.3226 rev
31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable
Pro Comfort$12.5827 rev
31 Gauge 5/16 Inch/8mm Pen Accessories Pack of 200 Thin-Wall Channel Design Individually Wrapped
Pegmapri$25.8419 rev
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$10.9917 rev
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$11.7419 rev
Trending
90-day click momentum
iHome Pen Tips 31G x 8mm Universal Fit 100 Count Comfortable
iHome$10.244.8★
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$11.744.5★
ONE-CARE Pen Tips 31G x 8mm 100 Count Twist-On Design Thin-Wall Structure ref 3019-01
ONE-CARE$12.324.4★
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$9.994.6★
31G 8mm Pen Tips Universal Fit 100 PCS Pen Tip Comfortable
Pro Comfort$12.584.3★
What buyers say about pen needles 31g 8mm
What buyers praise and complain about, mined from review topics.What buyers love
“Good deal”
“Excellent Quality”
“These fit like a glove and fit perfectly”
“easy to control”
“Works as advertised”
“They are comfortable”
“These pen needles work well”
“Nice and sharp”
“They are individually sealed”
“The universal twist-on design works perfectly”
What buyers complain about
“Tiny”
“I've noticed the quality is very inconsistent”
“Dull and painful”
“these needles definitely don't appear to be as sharp”
“meaning they are slightly thicker than the 32G I am used to”
“bend more easily than some others”
“Needles are very weak”
“found the price went up twice the original”
“I hardly feel them during use”
“which was also uncomfortable”
Top return reasons
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.