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.

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.

Returns

Incredible0.2%

return rate — above 5% kills the launch gate

Review moat

Incredible74.23

avg incumbent reviews — the moat a new listing must climb

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Market size

Good¥833K

¥833K/yr · 9K searches

Conversion

Good5.5%

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

Growth

Bad-10.4%

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

Competition

Bad77%

top-5 click share — a locked-up shelf

Brand share

Bad100%

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

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

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

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

77%

Top 20: 100%

Open market

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.

Open 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.

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

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¥1230.304.3★80 rev

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¥1601.854.5★331 rev

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¥1224.084.4★33 rev

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¥1279.844.3★36 rev

Silky ユーエム工業シルキーゴムボーイ万能目替刃 210mm

Silky¥1756.564.2★56 rev

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¥2485.945 rev

4mo ago

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¥3545.020 rev

1y ago

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¥2543.930 rev

6y ago

Silky ユーエム工業シルキーゴムボーイ万能目替刃 210mm

Silky¥1756.5656 rev

8y ago

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¥1544.68123 rev

10y ago

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.