PSA graded guards to protect your slabs. These slip around your PSA slabs to protect them from being scratched or dropped. This particular model will only work when printing with TPU as it is a tight fit. Currently working on a different model for AMS TPU or PLA. Print in a multitude of different colors to match your graded cards! Go great with Pokémon cards but will fit any PSA cards as long as they are standard thickness. They are a SNUG fit you will need to slide the top end of the slab in first and then do the bottom corners 1 at a time. It does require a little stretching to get it on but its not bad-PLA will not work as it will not stretch over the slab to get it on. Thanks for looking :)