CAP RWPBIS-010B Weight Plates
- Plate
- 4
- Cast Iron
- Black
- More reviewed than 94%
A straightforward cast iron plate for rounding out a home set, worth confirming against your bar's bore size before ordering.
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How it ranks among the 114 plates we track
4.7★ across 1,900 Amazon ratings, Bayesian-smoothed toward the category average.
1,900 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
300+ bought on Amazon last month.
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
Cast iron and finished in black, the CAP RWPBIS-010B is a standard weight plate listed at 10 pounds with 4 pieces per pack, built to load barbells and dumbbell handles in CAP's standard plate line.
Cast iron is the traditional standard-plate material, prized for density and shelf life over rubber-coated alternatives, though it chips floors and clangs more than a coated plate. The pack count of 4 suggests this ships as a set rather than a single disc, so confirm whether that means two pairs or four separate plates before matching it to a bar.
- Cast iron construction
- 10 pound item weight
- Black finish
- 4 pieces per pack
Who it's for
Home lifters filling out a standard weight set who already own a standard bar or dumbbell handles. Not for anyone who needs Olympic bore plates or wants rubber coating to protect flooring.
Strengths and trade-offs
Drawn from this product's published specifications.
- Cast iron holds up over years of regular use
- Uniform black finish across the set
- No bore size stated, confirm bar fit before buying
- Bare metal can damage floors without a mat
Performance notes
Cast iron plates hold their shape indefinitely and do not degrade the way rubber coatings can, but bare metal marks floors and rack surfaces without a mat underneath, and the exposed edges chip paint on contact.
Specifications
| Brand | CAP |
|---|---|
| Model | RWPBIS-010B |
| Pieces | 4 |
| Material | Cast Iron |
| Color | Black |
| Item Weight | 10 pounds |
Other CAP plates
How it compares
This product against the closest alternatives we track in plates.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| CAP RWPBIS-010B Weight PlatesThis product | 4.7 / 5 | 1,900 | 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 |
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Questions about the CAP RWPBIS-010B
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is the CAP RWPBIS-010B made of?
Cast iron, per the listed spec sheet.
How many plates come in the RWPBIS-010B pack?
The listing shows 4 pieces per pack.