Protect your graded cards from scratches, scuffs, chips, and cracks with BCW Slab Bumpers. These Slab Bumpers are sized to hold the modern, standard-card slabs from Professional Sports Authenticator (PSA). Slab Bumpers are made from durable thermoplastic elastomers (TPE), which has elastic properties similar to silicone. Insert the PSA slab through the back of the bumper, which is the side with the rounded corners (the BCW logo is on the front).