Is cast iron weights profitable to sell on Amazon United Kingdom?

The niche generates £69K/yr across 65 tracked products. 3 of 8 products launched in the last 360 days are still selling. 90-day search growth is +0.9%. Flapen's verdict: Worth a look (51/100).

How competitive is the cast iron weights niche?

27 brands and 36 sellers compete. The top 5 products take 26% of clicks and top 5 brands hold 67% of demand.

What do buyers complain about in cast iron weights?

Top complaints mined from reviews: Smell, Weight Heavy, Quality-Overall. The return rate is 0.3%.

What does it cost to enter the cast iron weights niche?

Listings span £5.15–£175.38; the average listing price is £39.59 (sweet spot $15–$100). The average incumbent carries 970 reviews — the moat a new listing must climb.

cast iron weights

Worth a look

Shows low returns (0.3%), but a small market ($69K/yr) keeps it on the watch list.

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Avg price

Incredible£39.59

avg listing price — sweet spot $15–$100

Competition

Great26%

top-5 click share — an open shelf

Brand share

Good67%

top-5 brand share — brands hold most of the demand

Review moat

Good970.45

avg incumbent reviews — the moat a new listing must climb

Price range

Good£5.15–£175.38

cheapest to priciest tracked listing — scored on the share inside $15–$100

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Okay+0.9%

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

Conversion

Bad1.5%

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

Market size

Bad£69K

£69K/yr · 120K searches

According to Flapen's Amazon United Kingdom niche tracking, cast iron weights is a £69K/yr Amazon United Kingdom market (120K searches/yr). The top 5 brands hold 67% of demand. Verdict: Worth a look — 51/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

cast iron weights market data

Units sold / yr: 2K–2K; avg 0–100/product
Revenue / yr: £59K–£79K; units × avg price
Conversion rate: 1.5%
Avg BSR: #99
Page quality: 0%
Prime: 42%
Sponsored: 74%
Out of stock: 7.5%
Avg brand age: 49 months
Avg seller age: 202 days

Competition & brand share

Clicks spread well past the top 5 (26% combined) — an open shelf where new products get seen.

Brands

27 rising

Sellers

Top-5 brand share

67%

Top 20: 97%

Top-5 click share

26%

Top 20: 62%

Open market

28%

Amazon Basics21%
York Fitness20%
Gallant11%
Chase Fitness8%
Amonax7%
Phoenix Fitness5%

Demand

Weekly Amazon search volume, last 33 weeks — +0.9% search growth over the last 90 days.

Open Trend

Top cast iron weights search terms

cast iron weights21K/yr -11.4%0.6% conv.
cast iron dumbbells set19K/yr -7.7%1.4% conv.
cast iron weight plates14K/yr +0.2%0.7% conv.
york weights14K/yr +1.8%1.7% conv.
metal weights9K/yr +6.6%0.6% conv.
york dumbbells set9K/yr +10.3%1.1% conv.
york weight plates7K/yr +11.1%2.4% conv.
cast iron dumbbells6K/yr +9.7%1.3% conv.
metal dumbbells set6K/yr +8.8%0.8% conv.
iron weights4K/yr +30.3%0.7% conv.

All search terms

Top cast iron weights 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★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Gallant Weight Plates - 5kg Standard 1 Inch Vinyl Weights Discs 20kg Set For Men Women - Weight Plate Set for Lifting Dumbbells Barbell Home Gym Fitness Training Equipment (Black 5kg x 4)

Gallant£20.264.6★658 rev

Amazon Basics Rubber Encased Hex Dumbbell Weights Set 10 kg Black

Amazon Basics£29.794.6★736 rev

York Fitness 20 kg Cast Iron Spinlock Dumbbell - Adjustable Hand Weights Set (Pack of 2) - Black

York Fitness£37.774.6★3,434 rev

York 4x 5kg Black Cast Iron 1Inch Plates

York Fitness£37.854.8★1,246 rev

Amazon Basics 2.5 cm Grip Weight Plates 10 kg Weight Single Charcoal

Amazon Basics£16.294.7★320 rev

Newest

by launch date

SPORTNOW 2-in-1 Adjustable Dumbbells Set 20kg Cast Iron Dumbbells Set

SPORTNOW£28.329 rev

6mo ago

Amazon Basics 2.5 cm Grip Weight Plates 10 kg Weight Single Charcoal

Amazon Basics£16.29320 rev

10mo ago

Amazon Basics 2.5 cm Grip Weight Plates 1.25 kg Weights Set of 4 Charcoal

Amazon Basics£12.25320 rev

10mo ago

Amazon Basics Rubber Encased Hex Dumbbell Weights Set 10 kg Black

Amazon Basics£29.79736 rev

1y ago

Amazon Basics Rubber Encased Hex Dumbbell Weights Set 6 kg Black

Amazon Basics£20.04736 rev

1y ago

What buyers say about cast iron weights

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall33%

“Good quality set”

Value For Money20%

“Excellent value for money”

Weight Heavy5%

“Incredible weights”

Advertised Vs Actual Product5%

“As described”

Grip4%

“Comfortable grip”

Ease Of Use4%

“Easy to use”

Weight Light3%

“Great starter weights with detachable weights so start light then add more to heavier - great idea”

Size-Overall3%

“not too snuggly”

Durability2%

“Durable product”

Adjustability/Rotatability/Reclining2%

“Adjustable”

What buyers complain about

Smell13%

“Bad smell”

Weight Heavy10%

“I also think maybe its slightly heavier than actual 8kg”

Quality-Overall9%

“Very Garbage”

Size-Overall8%

“bigger than I thought”

Value For Money4%

“But costly”

Durability4%

“Broke after a month”

Product Condition4%

“Arrived dirty, damaged and looked like they had been used and not new”

Strength3%

“Join in middle weak”

Defective Material/Parts2%

“Broken piece”

Advertised Vs Actual Product2%

“The description says 20kg but 17kg in actual.”

Top return reasons

Size-Overall28%

Weight Heavy17%

Defective Material/Parts9%

Advertised Vs Actual Product5%

Quality-Overall5%

Compatibility-Overall4%

Smell4%