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54

cs ヤスリ

Worth a look

Shows a thin review moat (25 avg reviews), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.

Market size 79Growth 38Conversion 88Competition 33Returns 99Price range 0Avg price 0Brand share 0Review moat 99Quality gap 78

Review moat

Incredible24.8

avg incumbent reviews — the moat a new listing must climb

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Conversion

Great10.4%

search→purchase rate — share of searches ending in a sale

Market size

Great¥1.1M

¥1.1M/yr · 11K searches

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Growth

Okay+10.0%

90-day search growth — must beat 0% to launch

Competition

Okay65%

top-5 click share — leaders hold, buyers still browse

Brand share

Bad100%

top-5 brand share — brand-locked demand

Avg price

Bad¥973.57

avg listing price — sweet spot $15–$100

Price range

Bad¥324.71–¥2858.39

cheapest to priciest tracked listing — scored on the share inside $15–$100

According to Flapen's Amazon Japan niche tracking, cs ヤスリ is a ¥1.1M/yr Amazon Japan market (11K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan–Dec. Verdict: Worth a look — 54/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

cs ヤスリ market data

Units sold / yr
750–1K
avg 0–100/product
Revenue / yr
¥730K–¥974K
units × avg price
Conversion rate
10.4%
Avg BSR
#271
Page quality
0%
Prime
95%
Sponsored
10%
Out of stock
0.0%
Avg brand age
43 months
Avg seller age
169 days

Competition & brand share

The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.

Brands

2 falling

Sellers

31

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

65%

Top 20: 100%

Open market

0%

  • アルゴファイル(Argofile)90%
  • DSPIAE10%
  • Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 86 weeks — +10.0% search growth over the last 90 days.
800600Holiday '24Spike '25Spike '26Prime Day '26JanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun

Peak months: Jan, Dec · busiest ÷ quietest = 3.2×

Top cs ヤスリ 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%5%¥53K10%¥106K15%¥159K20%¥212K110100 Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 20 tracked products in this niche — three views at once, no toggling.

What buyers say about cs ヤスリ

What buyers praise and complain about, mined from review topics.

What buyers love

使用の容易さ25%

“便利すぎる”

総合品質25%

“良い商品”

耐久性25%

“長持ち”

デザイン全体8%

“ただし、形がデザインカッターの形なので. 用途は絞らると思います。”

What buyers complain about

厚み33%

“こちらと比較しても圧倒的に薄いです。”

耐久性33%

“落としてしまって、床に当たって折れました・・・”

Common questions

Is cs ヤスリ profitable to sell on Amazon Japan?
The niche generates ¥1.1M/yr across 20 tracked products. 90-day search growth is +10.0%. Flapen's verdict: Worth a look (54/100).
How competitive is the cs ヤスリ niche?
2 brands and 31 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in cs ヤスリ?
Top complaints mined from reviews: 厚み, 耐久性. The return rate is 0.3%.
When does demand for cs ヤスリ peak?
Demand peaks in Jan–Dec; the busiest month runs 3.2× the quietest.
What does it cost to enter the cs ヤスリ niche?
Listings span ¥324.71–¥2858.39; the average listing price is ¥973.57 (sweet spot $15–$100). The average incumbent carries 25 reviews — the moat a new listing must climb.