What Is a Sports Card Slab?

A slabis the sealed, hard plastic holder a third-party grading company (PSA, BGS, SGC, CSG, and similar) puts a card inside after grading it. The card sits in a rigid inner cassette sandwiched between two plastic shells, which are then fused or screwed shut so the card can't be removed without visibly breaking the case. A printed label with the grade and identifying details is sealed inside along with it. "Slab" refers to that holder and everything inside it as a unit — not the grade number by itself, and not just any hard plastic card case someone bought at a shop.

• The card itself, floating in a fitted plastic cassette sized to its dimensions so it can't shift or rattle around inside the outer shell.
• The label, a separate printed insert (not printed directly on the plastic) showing the cert number, grade, and card details, sealed on top of or alongside the card.
• Two outer shells, front and back, that clamp the cassette and label together and form the tamper-evident seal — fused with sonic welding on most modern holders, or screwed together on some older and specialty holders.

The card is not glued, taped, or otherwise physically altered to fit — it's held in place purely by the fitted cassette, which is part of why a card can later be cracked out and resubmitted to a different grading company without damage.

The whole point of a slab is trust at a distance: a buyer who has never seen the physical card in person can still trust that the grade on the label belongs to the exact card behind the plastic, because breaking that link means visibly breaking the case. That tamper-evident seal is what makes grading valuable as a market signal in the first place — without it, a label could be swapped onto a different card, or a low-grade card could be passed off next to someone else's high grade. The rigid case also protects against the everyday damage that lowers a raw card's condition over time — corner dings, surface scuffs, bent edges — which is why a card's grade, once slabbed, generally doesn't change just from being handled or shipped carefully.

Every grading company has released multiple holder generations — different plastic thickness, label fonts, hologram placement, and seal mechanisms — as security technology and design have evolved. That's normal and expected; an older slab isn't suspicious just because its holder looks different from a current one. What matters is that the holder design matches what the grading company actually used during that cert number's era. Counterfeiters try to copy holder designs, so it's worth knowing the tells — see how to spot a fake graded slab for what to check on the case itself, beyond the label.

Rawmeans a card that has never been graded and encapsulated — it's loose, or protected only by a penny sleeve and/or a top-loader, both of which are removable without breaking anything. Slabbedmeans encapsulated by a grading company with a grade attached. The two aren't just a condition difference — a raw card's condition is a matter of opinion until someone grades it, while a slabbed card's grade is a documented, cert-number-backed claim you can verify. That verifiability is a real part of what buyers pay for beyond the plastic itself. See how grading actually works for what happens to a card before it comes back sealed.

• Look up the cert number with our cert lookup tool and confirm the grader's own record matches the player, year, set, and grade shown on the physical label in the photos.
• Inspect the case, not just the label. Cracks, cloudy or scratched plastic, or a seal that looks re-done are all things worth asking about — see what to do if a case cracks for whether a cracked case affects the grade underneath.
• Don't assume newer holders are worth more. Holder generation is a design detail, not a value driver by itself — the grade, the card, and the player still do almost all of the pricing work.

Confirm the exact card with Identify & Research — free-path first (on-device OCR, catalog match, and fingerprints). For what every field on the sealed label means, see How to Read a Graded Card Label. For counterfeit-specific tells on the holder itself, see How to Spot a Fake Graded Slab, or open the full guides library.