backer rod 3/8 inch
Worth a lookShows searches that convert (13.9% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Conversion
Incredible13.9%search→purchase rate — share of searches ending in a sale
Avg price
Great$19.96avg listing price — sweet spot $15–$100
Review moat
Great471.19avg incumbent reviews — the moat a new listing must climb
Price range
Good$4.39–$133.71cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good48%top-5 click share — leaders hold, buyers still browse
Brand share
Good69%top-5 brand share — brands hold most of the demand
Returns
Good2.7%return rate — above 5% kills the launch gate
Growth
Okay+19.7%90-day search growth — must beat 0% to launch
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Market size
Bad$49K$49K/yr · 18K searches
According to Flapen's Amazon United States niche tracking, backer rod 3/8 inch is a $49K/yr Amazon United States market (18K searches/yr). The top 5 brands hold 69% of demand. Verdict: Worth a look — 56/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
backer rod 3/8 inch market data
- Units sold / yr
- 3K–3K
- avg 100–250/product
- Revenue / yr
- $50K–$60K
- units × avg price
- Conversion rate
- 13.9%
- Avg BSR
- #551
- Page quality
- 0%
- Prime
- 97%
- Sponsored
- 84%
- Out of stock
- 3.9%
- Avg brand age
- 59 months
- Avg seller age
- 186 days
Competition & brand share
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.Brands
16 rising
Sellers
46
Top-5 brand share
69%
Top 20: 100%
Top-5 click share
48%
Top 20: 90%
Open market
24%
- zzhxkjhky26%
- Frost King13%
- Macepason13%
- Taikula9%
- Tondiamo8%
- Storystore7%
Demand
Weekly Amazon search volume, last 38 weeks — +19.7% search growth over the last 90 days.Top backer rod 3/8 inch search terms
- 3/8 backer rod7K/yr
- backer rod 3/8 inch5K/yr
- backer rod 3/86K/yr
Top backer rod 3/8 inch 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
Frost King C21CP-C Caulk Saver Bulk Contractor Pack 3/8-inch Diameter x 350-feet Long Grey
Frost King$35.284.6★921 rev
Foam Backer Rod for Gaps Concrete Crack Filler Joints Foam Gap Filler Caulk Saver Backing Rod Filler Rope Concrete Joint Filler (3/8 Inch x 10 Feet)
Macepason$7.884.5★379 rev
3/8 Diameter x 40 Length Backer Rod Caulk Saver Foam Backer Rod for Gaps and Joints Backing Concrete Filler
zzhxkjhky$13.894.5★614 rev
Tondiamo Caulk Saver Foam Backer Rod Gap Filler Concrete Rope Caulk Gray Sealant Backing Rod for Fence Wall Gap Floor Window Door Windproof Home Repairing(3/8 Inch x 50 Ft)
Tondiamo$16.264.5★482 rev
59FT Length Backer Rod Foam Caulk Saver for Concrete Filling Joints and Gaps 3/8 in Diameter x 59FT Length (Grey)
ToLanbbt$15.584.6★249 rev
Newest
by launch dateFoam Backer Rod for Gaps Concrete Crack Filler Joints Foam Gap Filler Caulk Saver Backing Rod Filler Rope Concrete Joint Filler (3/8 Inch x 10 Feet)
Macepason$7.88379 rev
10FT Backer Rod 3/8 Inch Diameter Rubber Caulk Concrete Expansion Joint Filler White Saver Weather Strip Seal for Gaps and Joints Concrete Filling (3/8 Inch x 10FT)
Taikula$9.61148 rev
15FT Backer Rod 3/8 Inch Diameter Rubber Caulk Concrete Expansion Joint Filler Black Rubber Caulk Saver Weather Stripping for Gaps and Joints Filling(3/8 Inch x 15FT)
Taikula$11.8989 rev
10FT Backer Rod 3/8 Inch Diameter Rubber Caulk Concrete Expansion Joint Filler Black Rubber Caulk Saver Weather Stripping for Gaps and Joints Filling(3/8 Inch x 10FT)
Taikula$10.3889 rev
PATIKIL 3/8 Inch x 32.8 Feet Backer Rod for Gaps and Joints Foam Rope Caulk Crack Joint Filler Roll Seal Weather Strip for Home Construction Car White
PATIKIL$9.75101 rev
Trending
90-day click momentum
Storystore Backer Rod 3/8 Diameter x 16.4 Length Black EPDM Rubber Caulk Saver Foam Backer Rod for Gaps and Joints Concrete Expansion Joint Filler
Storystore$12.514.5★
M-D Building Products - Versatile Gray Foam Backer Rod Set 1/2in x 20ft - Essential Caulk Saver for Sealing Concrete Gaps Expansion Joints and Crack Filling (71480)
M-D Building Products$4.394.6★
3/8 Diameter x 150 Length Backer Rod Caulk Saver Foam Backer Rod for Gaps and Joints Backing Concrete Filler
zzhxkjhky$25.464.5★
Foam Backer Rod for Gaps Concrete Crack Filler Joints Foam Gap Filler Caulk Saver Backing Rod Filler Rope Concrete Joint Filler (3/8 Inch x 10 Feet)
Macepason$7.884.5★
PATIKIL 3/8 Inch x 32.8 Feet Backer Rod for Gaps and Joints Foam Rope Caulk Crack Joint Filler Roll Seal Weather Strip for Home Construction Car White
PATIKIL$9.754.2★
What buyers say about backer rod 3/8 inch
What buyers praise and complain about, mined from review topics.What buyers love
“Price is right”
“Easy to use”
“Product as described”
“Worked great”
“Great quality & sealing ability, highly versatile & easy to use”
“The material looks to be pretty good for backer rod applications”
“Did the job keeping water out post base”
“Make window maintenance easy”
“Easy installation”
“It is simple to cut to size”
What buyers complain about
“I ended up paying a lot more per foot than had I bought new”
“The product was heavier than I thought”
Top return reasons
Common questions
- Is backer rod 3/8 inch profitable to sell on Amazon United States?
- The niche generates $49K/yr across 32 tracked products. 90-day search growth is +19.7%. Flapen's verdict: Worth a look (56/100).
- How competitive is the backer rod 3/8 inch niche?
- 16 brands and 46 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 69% of demand.
- What do buyers complain about in backer rod 3/8 inch?
- Top complaints mined from reviews: Value For Money, Weight Heavy. The return rate is 2.7%.
- What does it cost to enter the backer rod 3/8 inch niche?
- Listings span $4.39–$133.71; the average listing price is $19.96 (sweet spot $15–$100). The average incumbent carries 471 reviews — the moat a new listing must climb.