---
title: "Cs ヤスリ — ¥1.1M/yr Amazon JP Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/jp/diy/cs"
last_updated: "2026-08-08T07:43:52.515Z"
locale: en
meta:
description: "Niche score 54/100 · ¥1.1M/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 54/100 · ¥1.1M/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Cs ヤスリ — ¥1.1M/yr Amazon JP Niche (2026) - Flapen"
---
# **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**
**Incredible****24.8**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****10.4%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Great****¥1.1M**
¥1.1M/yr · 11K searches
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+10.0%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Bad****100%**
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
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=jp&signal=low_review_barrier "Top brand's reviews < 500") [** High Price**](https://flapen.com/research/niches?market=jp&signal=high_price "Avg price > $50")
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 ~~](https://flapen.com/research/methodology)
## **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 '26 seasonJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Jan, Dec · busiest ÷ quietest = 3.2×
[**Open Trend **](https://flapen.com/research/jp/diy/cs/trend)
## **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 moatMarket 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.
### **Top sellers**
by 90-day click share
[1**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #400 HCF0400(10枚入)**アルゴファイル(Argofile)**¥460.13**4.2★42 rev](https://www.amazon.co.jp/dp/B0C3LWYD2H) [2**アルゴファイル(Argofile) CSヤスリ用ハンドツール CSホルダー フラット CSH-25F**アルゴファイル(Argofile)**¥1452.99**4.2★47 rev](https://www.amazon.co.jp/dp/B0D9N2FZCD) [3**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #800 HCF0800(10枚入)**アルゴファイル(Argofile)**¥456.81**4.4★39 rev](https://www.amazon.co.jp/dp/B0C3LWPTQQ) [4**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #600 HCF0600(10枚入)**アルゴファイル(Argofile)**¥407.25**4.3★27 rev](https://www.amazon.co.jp/dp/B0C3LWQRKL) [5**DSPIAE ハンドサンダー【日本正規代理店】… (平面タイプ（レッド）)**DSPIAE**¥1162.93**4.4★43 rev](https://www.amazon.co.jp/dp/B0CPDY12ZC)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**アルゴファイル(Argofile) CSヤスリ用ハンドツール CSホルダー フラット CSH-25F**アルゴファイル(Argofile)**¥1452.99**47 rev2y ago](https://www.amazon.co.jp/dp/B0D9N2FZCD) [**アルゴファイル(Argofile) CSヤスリ用当板 CSカーボンプレート 先1mmセット CSPS-01**アルゴファイル(Argofile)**¥859.64**19 rev2y ago](https://www.amazon.co.jp/dp/B0D9MZW99R) [**アルゴファイル(Argofile) CSヤスリ用当板 CSカーボンプレート 25mmエッジカット CSP-25F**アルゴファイル(Argofile)**¥842.81**3 rev2y ago](https://www.amazon.co.jp/dp/B0D9N2VVQ4) [**アルゴファイル(Argofile) CSヤスリ用当板 CSカーボンプレート 先2mmセット CSPS-02**アルゴファイル(Argofile)**¥868.51**2 rev2y ago](https://www.amazon.co.jp/dp/B0D9N3VPQK) [**DSPIAE ハンドサンダー【日本正規代理店】… (平面タイプ（レッド）)**DSPIAE**¥1162.93**43 rev2y ago](https://www.amazon.co.jp/dp/B0CPDY12ZC)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #2000 HCF2000(10枚入)**アルゴファイル(Argofile)**¥458.19**4.1★**▲ 146%**](https://www.amazon.co.jp/dp/B0C3LWL3G2) [**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #280 HCF0280(10枚入)**アルゴファイル(Argofile)**¥408.92**4.2★**▲ 136%**](https://www.amazon.co.jp/dp/B0C3LWK4WQ) [**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #180 HCF0180(10枚入)**アルゴファイル(Argofile)**¥489.32**3.9★**▲ 94%**](https://www.amazon.co.jp/dp/B0C3LVRN26) [![DSPIAE[正規販売店] 高耐久スポンジヤスリセット #180～#2500【各種入賞モデラー推奨】 (SS-S01)](https://m.media-amazon.com/images/I/41J0ziCZeSL.jpg)**DSPIAE\[正規販売店\] 高耐久スポンジヤスリセット #180～#2500【各種入賞モデラー推奨】 (SS-S01)**DSPIAE**¥2253.13**4.4★**▲ 71%**](https://www.amazon.co.jp/dp/B0CM2J9R9G) [**アルゴファイル(Argofile) 小判糊付紙ヤスリ CSヤスリ #1500 HCF1500(10枚入)**アルゴファイル(Argofile)**¥489.20**4.0★**▲ 70%**](https://www.amazon.co.jp/dp/B0C3LSYXZ4)
**~~View all trending →~~**
## **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.
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