---
title: "Styrofoam Half Sphere — $33K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/arts-crafts-sewing/styrofoam-half-sphere"
last_updated: "2026-08-09T08:06:01.415Z"
locale: en
meta:
description: "Niche score 45/100 · $33K/yr market · 82K searches/yr · $14.68 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · $33K/yr market · 82K searches/yr · $14.68 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Styrofoam Half Sphere — $33K/yr Amazon US Niche (2026) - Flapen"
---
# **styrofoam half sphere**
**Skip it**
A small market ($33K/yr) — this niche doesn't clear our bar today.
Market size 8Growth 27Conversion 35Competition 77Returns 36Price range 60Avg price 72Brand share 51Review moat 79Quality gap 50
**Review moat**
**Great****417.26**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Great****38%**
top-5 click share — an open shelf
**Avg price**
**Good****$14.68**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$6.70–$27.50**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****74%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Good****4.5★**
avg incumbent rating — lower means beatable quality
**Returns**
**Okay****4.2%**
return rate — above 5% kills the launch gate
**Conversion**
**Okay****2.8%**
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 ~~](https://flapen.com/research/methodology)
## **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.
2K2KSpike '26Nov '25Dec '25Jan '26Mar '26Apr '26May '26
[**Open Trend **](https://flapen.com/research/us/arts-crafts-sewing/styrofoam-half-sphere/trend)
## **Top styrofoam half sphere search terms**
- **styrofoam half sphere**13K/yr+25.6%3.9% conv. - **foam half sphere**10K/yr-1.2%4.1% conv. - **styrofoam half balls**8K/yr-4.3%5.3% conv. - **half foam ball**7K/yr-1.9%3.5% conv. - **foam half ball**6K/yr+40.7%4.2% conv. - **half circle foam**5K/yr-4.3%2.2% conv. - **half sphere**5K/yr+8.5%0.7% conv. - **foam dome**5K/yr-4.5%3.0% conv. - **styrofoam dome**4K/yr+6.4%2.5% conv. - **half styrofoam balls**5K/yr-8.6%4.0% conv. [**All search terms **](https://flapen.com/research/us/arts-crafts-sewing/styrofoam-half-sphere/search-terms)
## **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.
0%3%$9996%$2K9%$3K12%$4K1101001K10K 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**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**$10.84**4.4★390 rev](https://www.amazon.com/dp/B0CBJLR4R6) [2**FloraCraft CraftFM Half Ball 2.8 x 5.8 Inch White**FloraCraft**$8.44**4.4★187 rev](https://www.amazon.com/dp/B07F6T961D) [3**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**$15.63**4.7★371 rev](https://www.amazon.com/dp/B0C77FBZ8R) [4**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**$15.75**4.7★371 rev](https://www.amazon.com/dp/B0CSLF29RJ) [5**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**$8.59**4.4★83 rev](https://www.amazon.com/dp/B0DMW5B5N2)
**~~View all top sellers →~~**
### **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**$17.25**5 rev4mo ago](https://www.amazon.com/dp/B0GQCYRMRV) [**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**$15.70**19 rev5mo ago](https://www.amazon.com/dp/B0FXX1GYK8) [**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**$14.68**5 rev7mo ago](https://www.amazon.com/dp/B0G48WDSFV) [**Evershine 6 Craft Foam Half Ball 2 Packs - Smooth Half Foam Polystyrene Balls for Craft and Project**Evershine**$14.61**207 rev7mo ago](https://www.amazon.com/dp/B0G2CZTTVZ) [**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**$16.95**408 rev1y ago](https://www.amazon.com/dp/B0DRF97XQJ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Evershine 6 Craft Foam Half Ball 2 Packs - Smooth Half Foam Polystyrene Balls for Craft and Project**Evershine**$14.61**4.6★**▲ 279%**](https://www.amazon.com/dp/B0G2CZTTVZ) [**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**$17.25**5.0★**▲ 277%**](https://www.amazon.com/dp/B0GQCYRMRV) [**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**$14.68**4.7★**▲ 155%**](https://www.amazon.com/dp/B0G48WDSFV) [**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**$7.71**4.4★**▲ 97%**](https://www.amazon.com/dp/B0C1H9PQ2T) [**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**$14.53**4.5★**▲ 57%**](https://www.amazon.com/dp/B0CSFC2FV5)
**~~View all trending →~~**
## **What buyers say about styrofoam half sphere**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**14%
*“These Half Foam Balls are great quality”*
**Advertised Vs Actual Product**13%
*“Exactly What I Needed”*
**Size-Overall**12%
*“Love the size”*
**Ease Of Use**10%
*“Easy to use”*
**Efficiency**8%
*“Works great and it's also an exercise tool”*
**Value For Money**7%
*“Good price”*
**Strength**5%
*“It was very sturdy”*
**Design-Overall**4%
*“Perfect for decorating and craft projects”*
**Weight Light**3%
*“Not heavy at all”*
**Soft Feel**3%
*“They are smooth”*
### **What buyers complain about **
**Size-Overall**28%
*“Too large for my project”*
**Hard Feel**9%
*“Very hard”*
**Value For Money**8%
*“a little pricey”*
**Adhesion/Stickiness**7%
*“You can't use super glue on them”*
**Ease Of Use**4%
*“I just couldn't use it”*
**Ease Of Cleaning**3%
*“Messy”*
**Soft Feel**3%
*“It is a little too soft”*
**Shape/Style**3%
*“Not circular”*
**Durability**3%
*“Fell apart when using them for my project”*
**Strength**3%
*“Didnt hold together”*
### **Top return reasons **
**Size-Overall**72%
**Advertised Vs Actual Product**6%
**Value For Money**4%
**Functionality-Overall**3%
**Hard Feel**2%
**Material Quality**2%
**Defective Material/Parts**1%
**Shape/Style**1%
**Ease Of Use**1%
**Quality-Overall**1%
## **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.
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