CGC vs PSA vs CBCS: What Actually Fits in a Universal Slab Protector
Three grading companies, three slab designs. Here's how the modern formats actually compare, and what 'universal fit' really means for a slab protector.
Modern slab dimensions, roughly
Modern CGC, PSA, and CBCS slabs are all designed around the same comic dimensions, so the outer footprint of the slabs is close, but not identical. The small differences are in rim thickness, edge profile, and corner radius. CGC modern: the longest-running format. Rim profile is consistent across the modern era. PSA modern: a newer entrant to comics. Slightly different corner radius and rim thickness. CBCS modern: close to CGC in footprint, with a distinct rim profile.
What "universal fit" really means
A universal-fit graded comic protector doesn't try to be precision-machined for each grading company. It uses a profile with enough tolerance to absorb the differences, usually by leaning on a flexible material like TPU that can snap cleanly onto rims with slightly different thicknesses. This is the same principle behind universal phone case tooling. The tolerances aren't loose, they're engineered around the range that real-world slabs actually fall into.
Why TPU matters here
Silicone is too soft, it stretches out over time and loses its grip on the slab. Hard plastic is too rigid, it cracks under flex and won't accommodate variation between graders. TPU sits in the middle. It's the same material family used in premium phone cases for the same reason: long-term shape retention plus enough flex to handle real-world tolerances.
Where universal fit ends
Universal fit is built for modern slabs from the major grading companies. Older slabs, reholdered slabs, and unusual formats (oversized, magazine, treasury) usually need their own approach. If your collection lives in modern CGC/PSA/CBCS, a universal protector is the cleanest answer. For a single-protector solution across a mixed-grader collection, that's exactly what KEYGUARD is built for. One profile, three grading companies, hundreds of slabs.