Ultra Pro - Graded Card Sleeves Resealable, Crystal Clear Premium Graded Trading Card Display Storage Sleeves Protectors

Thanks! UltraPro via amazon. I use name brand gradedguards and they fit perfectly. I just like them for keeping dust/debris out. They do limit ability to stack the slabs though. Just make sure if you use them that your hands are dry and you're not trapping any moisture. I keep a bunch of dessicant packs in the case I store my slabs in.