---
title: "Reviews — ゴムボーイ 210 替刃 - Flapen"
canonical_url: "https://flapen.com/research/jp/diy/210/reviews"
last_updated: "2026-08-08T10:58:16.016Z"
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": "Reviews — ゴムボーイ 210 替刃 - 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")

## Reviews