---
title: "ゴムボーイ 210 替刃 — ¥833K/yr Amazon JP Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/jp/diy/210"
last_updated: "2026-08-07T09:17:15.498Z"
locale: en
meta:
description: "Niche score 46/100 · ¥833K/yr market · 9K searches/yr · ¥1630.34 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 46/100 · ¥833K/yr market · 9K searches/yr · ¥1630.34 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "ゴムボーイ 210 替刃 — ¥833K/yr Amazon JP Niche (2026) - Flapen"
---
# **ゴムボーイ 210 替刃**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 74Growth 20Conversion 63Competition 19Returns 99Price range 0Avg price 0Brand share 0Review moat 96Quality gap 78
**Returns**
**Incredible****0.2%**
return rate — above 5% kills the launch gate
**Review moat**
**Incredible****74.23**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Market size**
**Good****¥833K**
¥833K/yr · 9K searches
**Conversion**
**Good****5.5%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Bad****-10.4%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****77%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Avg price**
**Bad****¥1630.34**
avg listing price — sweet spot $15–$100
**Price range**
**Bad****¥722.98–¥3545.02**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** High Price**](https://flapen.com/research/niches?market=jp&signal=high_price "Avg price > $50")
According to Flapen's Amazon Japan niche tracking, ゴムボーイ 210 替刃 is a ¥833K/yr Amazon Japan market (9K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 46/100.
Data updated Jul 30, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ゴムボーイ 210 替刃 market data**
- **Units sold / yr**
- **500–750**
- avg 0–100/product
- **Revenue / yr**
- **¥815K–¥1.2M**
- units × avg price
- **Conversion rate**
- **5.5%**
- **Avg BSR**
- **#41**
- **Page quality**
- **0%**
- **Prime**
- **77%**
- **Sponsored**
- **23%**
- **Out of stock**
- **2.8%**
- **Avg brand age**
- **171 months**
- **Avg seller age**
- **194 days**
## **Competition & brand share**
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**5 **—flat
**Sellers**
**39**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**77%**
Top 20: 100%
**Open market**
**0%**
- Silky90% - SK11(エスケー11)5% - アクロバート2% - 新潟精機(Niigataseiki)2% - ノーブランド品2%
## **Demand**
Weekly Amazon search volume, last 34 weeks — -10.4% search growth over the last 90 days.
250150Spike '26Prime Day '26Dec '25Jan '26Feb '26Mar '26Apr '26May '26Jul '26
[**Open Trend **](https://flapen.com/research/jp/diy/210/trend)
## **Top ゴムボーイ 210 替刃 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%10%¥83K20%¥167K30%¥250K40%¥333K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイ 荒目 替刃 210mm 295-21 生木の剪定、枝打ちに適した粗さ**Silky**¥1230.30**4.3★80 rev](https://www.amazon.co.jp/dp/B0014C4QRQ) [2**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイ 万能目 替刃 240mm 122-24 乾燥木材も生木も万能に切れる**Silky**¥1601.85**4.5★331 rev](https://www.amazon.co.jp/dp/B000CEAX9C) [3**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイ 細目 替刃 210mm 291-21 竹伐採、乾燥木材の切断に**Silky**¥1224.08**4.4★33 rev](https://www.amazon.co.jp/dp/B0014C4QP8) [4**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイカーブ 万能目 替刃 210mm 461-21 生木剪定がラクでスピーディに**Silky**¥1279.84**4.3★36 rev](https://www.amazon.co.jp/dp/B015XEV7LS) [5**Silky ユーエム工業 シルキー ゴムボーイ 万能目 替刃 210mm**Silky**¥1756.56**4.2★56 rev](https://www.amazon.co.jp/dp/B078VJGL8G)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**ユーエム工業(Silky) ゴムボーイ ブラック 万能目 刃渡り210mm 目数10枚目/30mm 剪定・木材切断 900-20**Silky**¥2485.94**5 rev4mo ago](https://www.amazon.co.jp/dp/B0GR4MJTVQ) [**Acro12A2616ゴムボーイ万能210替刃1枚&再生可能替刃セット01**ノーブランド品**¥3545.02**0 rev1y ago](https://www.amazon.co.jp/dp/B0DFWBX6ML) [**シルキー ゴムボーイ万能目２１０mm用替刃(通常便)**アクロバート**¥2543.93**0 rev6y ago](https://www.amazon.co.jp/dp/B082W1GQT7) [**Silky ユーエム工業 シルキー ゴムボーイ 万能目 替刃 210mm**Silky**¥1756.56**56 rev8y ago](https://www.amazon.co.jp/dp/B078VJGL8G) [**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイカーブ 荒目 替刃 240mm 464-24 生木剪定がラクでスピーディに**Silky**¥1544.68**123 rev10y ago](https://www.amazon.co.jp/dp/B016NMXMWG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Acro12A2616ゴムボーイ万能210替刃1枚&再生可能替刃セット01**ノーブランド品**¥3545.02**0.0★**▲ 217%**](https://www.amazon.co.jp/dp/B0DFWBX6ML) [**ユーエム工業(Silky) ゴムボーイ ブラック 万能目 刃渡り210mm 目数10枚目/30mm 剪定・木材切断 900-20**Silky**¥2485.94**4.2★**▲ 213%**](https://www.amazon.co.jp/dp/B0GR4MJTVQ) [**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイカーブ 荒目 替刃 240mm 464-24 生木剪定がラクでスピーディに**Silky**¥1544.68**4.4★**▲ 27%**](https://www.amazon.co.jp/dp/B016NMXMWG) [**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイ 細目 替刃 210mm 291-21 竹伐採、乾燥木材の切断に**Silky**¥1224.08**4.4★**▲ 24%**](https://www.amazon.co.jp/dp/B0014C4QP8) [**ユーエム工業(Silky) 折込鋸 鞘入鋸 ゴムボーイ 万能目 替刃 240mm 122-24 乾燥木材も生木も万能に切れる**Silky**¥1601.85**4.5★**▲ 17%**](https://www.amazon.co.jp/dp/B000CEAX9C)
**~~View all trending →~~**
## **What buyers say about ゴムボーイ 210 替刃**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**総合品質**29%
*“素晴らしい商品です。”*
**使用の容易さ**14%
*“使いやすい”*
**持ち運びやすさ**14%
*“どこでも手に入る”*
**商品の状態**14%
*“新品同様になります。”*
**耐久性**14%
*“耐久性がいい”*
**色**7%
*“ブラックが欲しくて購入。”*
**コストパフォーマンス**7%
*“コスパ最高”*
### **What buyers complain about **
**生锈/腐食する**33%
*“使い終わったらスプレーオイルを一吹き、錆びることはなくなる。”*
**厚み**33%
*“今焼酎の物より少し歯の厚みが 薄いようです”*
**硬い感覚**33%
*“粗めの刃でしたが、切れ味は良かった。”*
### **Top return reasons **
**サイズ全体**100%
## **Common questions**
- **Is ゴムボーイ 210 替刃 profitable to sell on Amazon Japan?**
- The niche generates ¥833K/yr across 13 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -10.4%. Flapen's verdict: Skip it (46/100).
- **How competitive is the ゴムボーイ 210 替刃 niche?**
- 5 brands and 39 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in ゴムボーイ 210 替刃?**
- Top complaints mined from reviews: 生锈/腐食する, 厚み, 硬い感覚. The return rate is 0.2%.
- **What does it cost to enter the ゴムボーイ 210 替刃 niche?**
- Listings span ¥722.98–¥3545.02; the average listing price is ¥1630.34 (sweet spot $15–$100). The average incumbent carries 74 reviews — the moat a new listing must climb.
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