styrofoam half sphere
Skip itA small market ($33K/yr) — this niche doesn't clear our bar today.
Review moat
Great417.26avg incumbent reviews — the moat a new listing must climb
Competition
Great38%top-5 click share — an open shelf
Avg price
Good$14.68avg listing price — sweet spot $15–$100
Price range
Good$6.70–$27.50cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Good74%top-5 brand share — brands hold most of the demand
Quality gap
Good4.5★avg incumbent rating — lower means beatable quality
Returns
Okay4.2%return rate — above 5% kills the launch gate
Conversion
Okay2.8%search→purchase rate — share of searches ending in a sale
Growth
Okay+1.8%90-day search growth — must beat 0% to launch
Market size
Bad$33K$33K/yr · 82K searches
According to Flapen's Amazon United States niche tracking, styrofoam half sphere is a $33K/yr Amazon United States market (82K searches/yr). The top 5 brands hold 74% of demand. Verdict: Skip it — 45/100.
Data updated Jul 8, 2026 · scored weekly · How we score niches
styrofoam half sphere market data
- Units sold / yr
- 3K–4K
- avg 0–100/product
- Revenue / yr
- $44K–$59K
- units × avg price
- Conversion rate
- 2.8%
- Avg BSR
- #131
- Page quality
- 0%
- Prime
- 98%
- Sponsored
- 93%
- Out of stock
- 0.4%
- Avg brand age
- 50 months
- Avg seller age
- 185 days
Competition & brand share
Clicks spread well past the top 5 (38% combined) — an open shelf where new products get seen.Brands
24 rising
Sellers
41
Top-5 brand share
74%
Top 20: 98%
Top-5 click share
38%
Top 20: 80%
Open market
22%
- Crafjie44%
- FloraCraft13%
- AHKUNMT9%
- vibedor5%
- Evershine4%
- GCVOPTON4%
Demand
Weekly Amazon search volume, last 36 weeks — +1.8% search growth over the last 90 days.Top styrofoam half sphere search terms
- styrofoam half sphere13K/yr
- foam half sphere10K/yr
- styrofoam half balls8K/yr
- half foam ball7K/yr
- foam half ball6K/yr
- half circle foam5K/yr
- half sphere5K/yr
- foam dome5K/yr
- styrofoam dome4K/yr
- half styrofoam balls5K/yr
Top styrofoam half sphere 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
Crafjie 8PCS 4 Inchs Half Foam Balls White Half Round Polystyrene Foam Balls Craft Supplies Hemispherical Christmas Craft Ballfor DIY Home Craft Project and Art Decoration
Crafjie$10.844.4★390 rev
FloraCraft CraftFM Half Ball 2.8 x 5.8 Inch White
FloraCraft$8.444.4★187 rev
Crafjie 2PCS 8 Inchs White Foam Balls Half Round Polystyrene Half Foam Balls Craft Supplies Hemispherical Christmas Craft Ballfor DIY Home Craft Project and Art Decoration
Crafjie$15.634.7★371 rev
Crafjie 4PCS 6 Inchs White Foam Balls Half Round Polystyrene Half Foam Balls Craft Supplies Hemispherical Christmas Craft Ballfor DIY Home Craft Project and Art Decoration
Crafjie$15.754.7★371 rev
vibedor 12 PCS 3 Inch Half Foam Balls White Styrofoam Balls Dry Foam Half Ball Small Styrofoam Balls for Christmas Thanksgiving Day and Festival for DIY Projects Home Craft Projects
vibedor$8.594.4★83 rev
Newest
by launch date
12 Foam Half Sphere Made in the USA Smooth White Polystyrene Hemisphere for DIY Crafts Floral Arrangements & School Projects High Density Pack of 1
Smoothfoam$17.255 rev
Yalumo Half Foam Balls for Crafts 10 Pack Multi-Size Smooth Polystyrene Half Round Foam Craft Ball for Floral Arrangements Wedding School Projects DIY Ornaments Holiday Decor (6 4 3)
Yalumo$15.7019 rev
12PC 4 Inch Styrofoam Half Balls Solid White Half Round Foam Balls for Crafts Smooth DIY Craft Foam Hemispheres for Model Building Holiday and Party Decorations (Half styrofoam-4in-12pc)
WERJOURU$14.685 rev
Evershine 6 Craft Foam Half Ball 2 Packs - Smooth Half Foam Polystyrene Balls for Craft and Project
Evershine$14.61207 rev
Styrofoam Half Balls 10 Inch 1PC Large White Half Foam Balls for Crafts DIY Craft Giant Foam Balls for Home and School Smooth Solid Round Balls (Half styrofoam-10in-1pc)
AHKUNMT$16.95408 rev
Trending
90-day click momentumEvershine 6 Craft Foam Half Ball 2 Packs - Smooth Half Foam Polystyrene Balls for Craft and Project
Evershine$14.614.6★
12 Foam Half Sphere Made in the USA Smooth White Polystyrene Hemisphere for DIY Crafts Floral Arrangements & School Projects High Density Pack of 1
Smoothfoam$17.255.0★
12PC 4 Inch Styrofoam Half Balls Solid White Half Round Foam Balls for Crafts Smooth DIY Craft Foam Hemispheres for Model Building Holiday and Party Decorations (Half styrofoam-4in-12pc)
WERJOURU$14.684.7★
Crafjie 22PCS 2 Inchs White Foam Balls Half Round Polystyrene Half Foam Balls Craft Supplies Hemispherical Christmas Craft Ballfor DIY Home Craft Project and Art Decoration
Crafjie$7.714.4★
Styrofoam Half Balls 6 Inch 4PC Large White Half Foam Balls for Crafts DIY Craft Giant Foam Balls for Home and School Smooth Solid Round Balls (Half styrofoam-6in-4pc)
AHKUNMT$14.534.5★
What buyers say about styrofoam half sphere
What buyers praise and complain about, mined from review topics.What buyers love
“These Half Foam Balls are great quality”
“Exactly What I Needed”
“Love the size”
“Easy to use”
“Works great and it's also an exercise tool”
“Good price”
“It was very sturdy”
“Perfect for decorating and craft projects”
“Not heavy at all”
“They are smooth”
What buyers complain about
“Too large for my project”
“Very hard”
“a little pricey”
“You can't use super glue on them”
“I just couldn't use it”
“Messy”
“It is a little too soft”
“Not circular”
“Fell apart when using them for my project”
“Didnt hold together”
Top return reasons
Common questions
- Is styrofoam half sphere profitable to sell on Amazon United States?
- The niche generates $33K/yr across 43 tracked products. 2 of 11 products launched in the last 360 days are still selling. 90-day search growth is +1.8%. Flapen's verdict: Skip it (45/100).
- How competitive is the styrofoam half sphere niche?
- 24 brands and 41 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 74% of demand.
- What do buyers complain about in styrofoam half sphere?
- Top complaints mined from reviews: Size-Overall, Hard Feel, Value For Money. The return rate is 4.2%.
- What does it cost to enter the styrofoam half sphere niche?
- Listings span $6.70–$27.50; the average listing price is $14.68 (sweet spot $15–$100). The average incumbent carries 417 reviews — the moat a new listing must climb.