pen needles 31g 5mm
Worth a lookShows low returns (0.1%), but strong incumbent ratings (4.7★) keeps it on the watch list.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Conversion
Incredible15.7%search→purchase rate — share of searches ending in a sale
Price range
Great$8.60–$50.25cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$17.64avg listing price — sweet spot $15–$100
Review moat
Good946avg incumbent reviews — the moat a new listing must climb
Brand share
Okay76%top-5 brand share — brands hold most of the demand
Competition
Okay57%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
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, pen needles 31g 5mm is a $186K/yr Amazon United States market (67K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in May. Verdict: Worth a look — 55/100.
Data updated Jul 10, 2026 · scored weekly · How we score niches
pen needles 31g 5mm market data
- Units sold / yr
- 10K–13K
- avg 250–500/product
- Revenue / yr
- $176K–$221K
- units × avg price
- Conversion rate
- 15.7%
- Avg BSR
- #447
- Page quality
- 0%
- Prime
- 90%
- Sponsored
- 62%
- Out of stock
- 13.0%
- Avg brand age
- 58 months
- Avg seller age
- 187 days
Competition & brand share
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%
Top 20: 97%
Top-5 click share
57%
Top 20: 100%
Open market
18%
- Medt35%
- GLUCO-CARE16%
- Sensifine10%
- Pro Comfort9%
- Pharmacy Choice7%
- Aicare5%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +6.2% search growth over the last 90 days.Peak months: May · busiest ÷ quietest = 1.7×
Top pen needles 31g 5mm search terms
- pen needles 31g 5mm27K/yr
- insulin pen needles 31g 5mm11K/yr
- 31g 5mm pen needles5K/yr
- ultra fine pen needles 31g 5mm4K/yr
- needles for insulin pens 5mm3K/yr
- embecta pen needles 31g 5mm4K/yr
- 5mm pen needles3K/yr
- bd ultra fine mini pen needles 5mm x 31g8K/yr
- bd uf mini pen needle 5mmx31g2K/yr
Top pen needles 31g 5mm 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 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$8.614.8★5,065 rev
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$10.304.7★292 rev
31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design
Pro Comfort$12.234.6★46 rev
Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices
Sensifine$16.004.9★45 rev
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$15.964.8★5,065 rev
Newest
by launch date31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design
Pro Comfort$12.2346 rev
Pen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use
Suqaoae$26.4713 rev
BD Ultra-Fine Mini Pen Tips 31G x 5mm 90 Count
Generic$50.250 rev
31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count
Pharmacy Choice$10.0725 rev
Pen Tips 31G x 4mm(5/32) Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count
Pharmacy Choice$10.4131 rev
Trending
90-day click momentumPen Tips 31Gx5mm Box of 200 Count Universal Design Extra Thin Single-Use
Suqaoae$26.474.8★
31G 5mm Pen Tips Universal Fit Easy to Use 100CT Comfortable Design
Pro Comfort$12.234.6★
31G x 5mm(3/16) Pen Tips Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count
Pharmacy Choice$10.074.8★
Pen Tips 31G x 4mm(5/32) Universal Fit SterileUltra-Thin Wall Technology. Comfortable and Precise100 Count
Pharmacy Choice$10.414.6★
Sensifine Pen Tips 31G x 5mm Box of 100 Universal Compatibility with most Pen Devices
Sensifine$16.004.9★
What buyers say about pen needles 31g 5mm
What buyers praise and complain about, mined from review topics.What buyers love
“Great deal”
“Overall build quality is consistent”
“easy to open”
“fit securely”
“Item as described”
“Extremely comfortable”
“Designed with universal fit compatibility”
“Great pen tips-sharp”
“performed well in everyday use”
“doesnt leak out”
What buyers complain about
“But got the wrong size”
“There is more discomfort initially”
“They are super thin”
“Lower quality needles can be quite uncomfortable”
“much cheaper”
“they didn't have enough quality control to identify”
“Some are clogged up & don't work”
“do not work”
“it takes a little more effort and time”
“In fact I can barely even feel it when I'm administering my insulin”
Top return reasons
Common questions
- Is pen needles 31g 5mm profitable to sell on Amazon United States?
- The niche generates $186K/yr across 21 tracked products. 6 of 11 products launched in the last 360 days are still selling. 90-day search growth is +6.2%. Flapen's verdict: Worth a look (55/100).
- How competitive is the pen needles 31g 5mm niche?
- 12 brands and 16 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 76% of demand.
- What do buyers complain about in pen needles 31g 5mm?
- Top complaints mined from reviews: Size-Overall, Pain Relief-Overall, Thickness. The return rate is 0.1%.
- When does demand for pen needles 31g 5mm peak?
- Demand peaks in May; the busiest month runs 1.7× the quietest.
- What does it cost to enter the pen needles 31g 5mm niche?
- Listings span $8.60–$50.25; the average listing price is $17.64 (sweet spot $15–$100). The average incumbent carries 946 reviews — the moat a new listing must climb.