CAP

CAP OSR6IS-100 Weight Plates

Plate
100
Cast Iron, Rubber
Black

4.4/ 5 on Amazon2,773Amazon ratings3,000+bought last month4.4ProductDome score

More reviewed than 96%

High confidenceLast refreshed Aug 4, 2026Amazon data + ProductDome analysis · methodology

Best forYou want rubber-coated plates that protect floors and reduce clang

Rubber-coated cast iron plates weighing in at 52.5 pounds per the listed spec, quieter on the drop than bare iron equivalents.

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ProductDome scorecard

How it ranks among the 114 plates we track

4.4/ 5ProductDome scoreHigh confidence

Owner satisfaction · 56% of scorecategory median 4.6★4.4

4.4★ across 2,773 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 235 ratings4.3

2,773 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score4.7

3,000+ bought on Amazon last month.

Data quality · 11% of score3.8

Brand identity, imagery, description and spec coverage.

The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 114 plates we track - how the scorecard works · full plates data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

Overview

Rubber-coated cast iron gives these CAP weight plates a quieter drop than bare iron, with a listed item weight of 52.5 pounds in black, suited to barbell or plate-loaded machine use.

The rubber coating over a cast iron core is the usual approach for reducing noise and floor damage compared with bare iron plates, and it typically also cuts down on chipping if plates are dropped.

52.5 pounds item weight
Cast iron core with rubber coating
Black finish
Rated 4.4 stars, about 3,000 bought in the past month

Who it's for

Suits lifters adding plate weight to a barbell or plate-loaded machine who want a quieter, floor-friendly option over bare cast iron. Not the choice for anyone needing an exact plate-by-plate breakdown confirmed up front.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

Rubber coating reduces noise and floor damage
Cast iron core keeps a dense, compact plate

What to check first

Exact plate breakdown is not specified in the data available here
Rubber coating may wear at the edges over time

Performance notes

Rubber coating over cast iron cuts impact noise and floor marking versus bare iron, while the cast core keeps the plates compact for their weight.

Specifications

Brand	CAP
Model	OSR6IS-100
Pieces	100
Material	Cast Iron, Rubber
Color	Black
Item Weight	52.5 pounds

How it compares

This product against the closest alternatives we track in plates.

Product	Amazon rating	Ratings	ProductDome score
CAP OSR6IS-100 Weight PlatesThis product	4.4 / 5	2,773	4.4 / 5
RitFit Weight Plates for BarbellRITFIT	4.8 / 5	1,565	4.4 / 5
EVERYMATE 1.25LB Change Plates Set Weight PlatesEVERYMATE	4.8 / 5	1,448	4.4 / 5
JFIT 20-6650-pr Weight PlatesJFIT	4.7 / 5	777	4.3 / 5
Yes4All R61J Weight PlatesYES4ALL	4.8 / 5	605	4.3 / 5

Frequently asked

Questions about the CAP OSR6IS-100

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

What are CAP OSR6IS-100 plates made of?

Cast iron with a rubber coating.

What color are they?

Black.

How much do they weigh?

The listed item weight is 52.5 pounds.