hollow blocks
Skip itA small market ($12K/yr) — this niche doesn't clear our bar today.
Review moat
Great260.1avg incumbent reviews — the moat a new listing must climb
Returns
Great1.7%return rate — above 5% kills the launch gate
Avg price
Great$97.72avg listing price — sweet spot $15–$100
Price range
Okay$29.97–$181.68cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay81%top-5 brand share — brands hold most of the demand
Conversion
Bad1.8%search→purchase rate — share of searches ending in a sale
Growth
Bad-12.7%90-day search growth — must beat 0% to launch
Competition
Bad78%top-5 click share — a locked-up shelf
Market size
Bad$12K$12K/yr · 7K searches
According to Flapen's Amazon United States niche tracking, hollow blocks is a $12K/yr Amazon United States market (7K searches/yr). The top 5 brands hold 81% of demand. Demand peaks in Nov–Dec. Verdict: Skip it — 35/100.
Data updated Jul 30, 2026 · scored weekly · How we score niches
hollow blocks market data
- Units sold / yr
- 100–250
- avg 0–100/product
- Revenue / yr
- $10K–$24K
- units × avg price
- Conversion rate
- 1.8%
- Avg BSR
- #479
- Page quality
- 0%
- Prime
- 70%
- Sponsored
- 70%
- Out of stock
- 3.9%
- Avg brand age
- 63 months
- Avg seller age
- 177 days
Competition & brand share
The top 5 products capture 78% of clicks — a locked-up shelf that new listings rarely crack.Brands
9 rising
Sellers
20
Top-5 brand share
81%
Top 20: 100%
Top-5 click share
78%
Top 20: 100%
Open market
13%
- Xylolin26%
- ECR4Kids24%
- Back2School Express14%
- Guidecraft10%
- Melissa & Doug6%
- WOODENFUN6%
- Open — no brand owns it (3 brands, 13%)
Demand & seasonality
Weekly Amazon search volume, last 78 weeks — -12.7% search growth over the last 90 days.Peak months: Nov, Dec · busiest ÷ quietest = 2.6×
Top hollow blocks search terms
- hollow blocks5K/yr
- hollow blocks for preschoolers1K/yr
- large hollow blocks607/yr
- hollow block set301/yr
Top hollow blocks 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 10 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
ECR4Kids Blocks and Arches Wooden Stacking Playset Montessori Toys Natural 18-Piece
ECR4Kids$156.884.6★124 rev
Xylolin Over-Sized Hollow Wooden Block Set for Kids Natural 29 Piece Set of Large Wood Blocks Preschool Toddler Building and Stacking Blocks Wooden Toys Building Blocks for Kindergarten
Xylolin$173.434.3★36 rev
Back2School Express Wooden Building Blocks for Kids Ages 3+ - 18 Piece Montessori STEM Learning Toy Set Natural Hollow Blocks for Toddlers Educational Preschool Stacking Toys
Back2School Express$140.084.0★9 rev
Guidecraft Mini Hollow Blocks - Set of 16: STEM Learning & Educational Toy for Children; Creativity and Focus Block Play Accessory Set
Guidecraft$80.395.0★9 rev
Melissa & Doug Jumbo Cardboard Blocks Building Set (40 pc) - Lightweight Building Toys and Montessori Toys for Toddlers and Preschool Learning Activities
Melissa & Doug$34.404.7★2,179 rev
Newest
by launch date
Dinhon 23PCS Sensory Blocks for Toddlers 1-3 & Kids 4-8 - Large Montessori Wooden Building Blocks with Rainbow Colors Stacking Toys for Boys Girls Sensory Play & Preschool Learning Toddler Gift
Dinhon$35.8617 rev
Back2School Express Wooden Building Blocks for Kids Ages 3+ - 18 Piece Montessori STEM Learning Toy Set Natural Hollow Blocks for Toddlers Educational Preschool Stacking Toys
Back2School Express$140.089 rev
WOODENFUN Wood Building Blocks Set for Kids 32 Pcs Rainbow Stacker Stacking Game Construction Toys Set Preschool Colorful Learning Educational Toys Geometry Wooden Blocks for Boys Girls
WOODENFUN$30.69103 rev
Large Wooden Building Blocks Set for Toddlers 36 PCS Big Colorful Rainbow Window Hollow Blocks Set Montessori STEM Construction Toy for Kids Sensory Stacking Blocks for Preschool Kindergarten Play
Xylolin$113.7710 rev
Xylolin Over-Sized Hollow Wooden Block Set for Kids Natural 29 Piece Set of Large Wood Blocks Preschool Toddler Building and Stacking Blocks Wooden Toys Building Blocks for Kindergarten
Xylolin$173.4336 rev
Trending
90-day click momentumWOODENFUN Wood Building Blocks Set for Kids 32 Pcs Rainbow Stacker Stacking Game Construction Toys Set Preschool Colorful Learning Educational Toys Geometry Wooden Blocks for Boys Girls
WOODENFUN$30.694.6★
Sterling 6.8mm HollowBlock2 Loop - Tan 19
Sterling$29.974.8★
Dinhon 23PCS Sensory Blocks for Toddlers 1-3 & Kids 4-8 - Large Montessori Wooden Building Blocks with Rainbow Colors Stacking Toys for Boys Girls Sensory Play & Preschool Learning Toddler Gift
Dinhon$35.863.7★
Constructive Playthings Junior Large Hollow Wooden Blocks for Toddlers and Kids Ages 2-7 Set of 18 Assorted Shapes Solid Hardwood
Constructive Playthings$181.685.0★
Melissa & Doug Jumbo Cardboard Blocks Building Set (40 pc) - Lightweight Building Toys and Montessori Toys for Toddlers and Preschool Learning Activities
Melissa & Doug$34.404.7★
What buyers say about hollow blocks
What buyers praise and complain about, mined from review topics.What buyers love
“They are pretty and wellmade”
“they are very durable”
“They are sturdy”
“Fun Toy for toddlers”
“Very quick and easy assembly”
“Colors are bright”
“The size are nice”
“My 3 and 4 year old students love the days that I bring these out and have a blast building and then tearing down”
“Had they all arrived in good condition Id say the value for your money is good”
“Definitely want to buy another set for my own personal collection”
What buyers complain about
“hard to put together”
“Besides, one piece is about to break at any moment”
“Very tiny”
“Flimsy”
“Poor quality”
“they are a bit bulky”
Top return reasons
Common questions
- Is hollow blocks profitable to sell on Amazon United States?
- The niche generates $12K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -12.7%. Flapen's verdict: Skip it (35/100).
- How competitive is the hollow blocks niche?
- 9 brands and 20 sellers compete. The top 5 products take 78% of clicks and top 5 brands hold 81% of demand.
- What do buyers complain about in hollow blocks?
- Top complaints mined from reviews: Assembly/Installation, Durability, Size-Overall. The return rate is 1.7%.
- When does demand for hollow blocks peak?
- Demand peaks in Nov–Dec; the busiest month runs 2.6× the quietest.
- What does it cost to enter the hollow blocks niche?
- Listings span $29.97–$181.68; the average listing price is $97.72 (sweet spot $15–$100). The average incumbent carries 260 reviews — the moat a new listing must climb.