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Rock Tumbler

Fail

The top 5 brands take 100% of clicks, so Rock Tumbler is a Fail.

Flapen Score
45
45 / 100
Ranks 4,022 of 5,777 Home & Garden niches · −6 vs the category median of 51
Market size
£101K/yr153K searches / yr
90-day growth
+33.2%search demand this quarter
Competition
70%top-5 click share · 5 brands · 13 sellers

Flapen Score

Rock Tumbler against its category

The dotted line is the Home & Garden average. Past it, Rock Tumbler is stronger. Inside it, weaker.

45Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Rock Tumbler market on Amazon at a glance

Shoppers on Amazon United Kingdom searched for Rock Tumbler 153K times last year and spent an estimated £101K. All 5 brands take every click. Demand peaks in Nov–Dec. Flapen scores it 45 out of 100, a Fail.

01 · Demand

1.3% of searches ended in a purchase last week.

Shoppers searched for this 153K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. In the latest week, 1.3% of those searches ended in a purchase. Searches in the last 90 days moved +33.2% against the 90 days before. Searches, conversion and average price together put the market at an estimated £101K a year.

Searches, last 12 months
153K
Growth, 90 days vs prior 90
+33.2%
Conversion, latest week
1.3%
Market size, estimated
£101Ka year
Peak month
December2.6× the quietest month
Top search term
rock tumbler72K searches a year

02 · Price

A sale here is worth £50.88.

Listings sell for £50.88 on average, from £24.30 to £83.69. Amazon reports units sold in ranges. This niche sold 3K to 4K a year. The average listing sells 100 to 250 of them. At £50.88 that is £5K to £13K a year per listing.

Average price
£50.88inside the $15 to $100 sweet spot
Price range
£24.30–£83.69
Amazon United Kingdom median price
£12.12across 27,606 niches
Units sold a year
3K–4K
Units per listing a year
100–250
Revenue per listing a year
£5K–£13K
Returns
1.8%of orders · Amazon United Kingdom median 0.6%

03 · Entry bar

The bar here is ads and reviews.

92% of listings pay for placement with sponsored ads. 92% ship with Prime. On an average day, 29.6% of listings are out of stock. The average listing ranks #331 within Glassware. It carries 2,192 reviews at 4.22 stars, so a new listing needs social proof before a better product.

Sponsored listings
92%
Prime listings
92%
Out of stock, average day
29.6%
Average rank
#331in Glassware
Average rating
4.22 starsAmazon United Kingdom average 4.36 stars
Average reviews
2,192per listing
Listings tracked
12

04 · Newcomers

Amazon counts 1 of last year's 5 launches as successful.

5 products launched here in the last 12 months. Amazon counts 1 of them as successful launches, new products that hit its first-year sales bar. The brands on the shelf have sold for 34 months on average, so a newcomer is not facing entrenched names.

Launched, last 12 months
5
Successful launches
1Amazon's first-year sales bar
Average brand age
34 months

Products

Top Rock Tumbler products & what they sell for

Every tracked product: its share of the shelf, its reviews, and its price.

Competition

Competition: brands, sellers & click share

The top 5 products take 70% of clicks. A locked shelf that new listings rarely crack.

£0£10K£20K£30K£40K101001K10K100K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

5 falling

Sellers

13

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

70%

Top 20: 100%

Open market

0%

  • Blue Marble53%
  • Jofuni28%
  • StemRock12%
  • Acmeenjoy5%
  • KomeStone4%
  • Open — no brand owns it (0%)

Demand

Rock Tumbler search demand

Weekly searches over the year, seasonality beneath. Pick a range.

7K5KSpike '24Holiday '24Spike '25Prime Day '25Black Friday '25SepDecMarJunAugNovMarMay

Peak months: Nov, Dec · busiest ÷ quietest = 2.6×

Search terms

Top Rock Tumbler search terms shoppers use

The exact words shoppers type, with yearly volume, growth, and conversion.

  • rock tumbler72K/yr
  • rock tumbler machine25K/yr
  • stone polishing machine11K/yr
  • stone polishing kit7K/yr
  • rock polisher9K/yr
  • stone polisher5K/yr
  • stone tumbler machine uk5K/yr
  • rock tumbler kit6K/yr
  • stone tumbler4K/yr
  • national geographic rock tumbler4K/yr

Reviews and returns

What reviews say buyers love and hate about Rock Tumbler

What buyers praise, what they complain about and why they send it back, from the reviews.

Complain

Durability34%−0.52

Not built to last

Band breaks

Broke after 6 weeks

Noise Level8%+0.27

It's a fairly noisy unit from the motor

A little noisy perhaps

Is quite noisy when turned on

Quality-Overall8%+0.38

Rubbish

Garbage product

Bad quality build

Value For Money7%+0.34

Not worth it

Over priced, no interaction and will only get used once

It is a bit pricey for what it is

Instructions/User Manual/Troubleshooting4%+0.98

No instructions

That there are no instructions with the Rock tumbler

Love

Quality-Overall15%+0.38

My son said it was well made

Good kit

Good quality

Ease Of Use13%+1.08

Easy to use

The kit is relatively easy to use although as others have said you may wish to watch some online tutorials to work out the best options for timing

when you have done it a few times it gets easier

Efficiency11%+0.76

Works fine

it seems to work well

Works well, pleased with the results of this product as we have used this before

Value For Money10%+0.34

Good machine for the price

Good value for money to start the hobby

Great product and a great price

Fun/Entertainment Experience7%

that is part of the fun

its much more fun to collect

Plenty of media for multiple batches so its great value for hobbyists or families into geology fun

Return

1.8% Return rate 18% Fixable by listing

Durability22%▁▁▁▄▃█

Not built to last

Band breaks

Broke after 6 weeks

Functionality-Overall22%▁▁▁▃█▄

ended up returning the whole thing as it was not functioning as it should

Size-Overall15%█▄▁▄▁▂
Defective Material/Parts13%▁█▂▂▅▂
Noise Level9%▁▁█▄▁▃

It's a fairly noisy unit from the motor

A little noisy perhaps

Is quite noisy when turned on

FAQ

Common Rock Tumbler questions

Answered from the same tracked data.