[61x91MM] Meowcafe Premium CPP Card Sleeve for Kpop Photocards Perfect Fit

- Size: 61x91mm For Double Sleeve with Inner sleeve 57x88mm or 58x89mm - Material: CPP ( Cast Unoriented Polypropylene) - Thickness: 0.1MM One-Side, 0.2MM Total - Features: Tear-resistant, strong and Clear CPP and PP are made of the same raw material but with different manufacturing techniques. Both CPP and PP are PVC-Free and Acid-Free CPP is stronger, here is why: the process to manufacture CPP requires the polymer to have a higher density and strength to withstand being pulled from different directions which makes it more tear-resistant CPP Sleeve is harder, so make it a bit not as smooth to slide in the card, but once the card is in, it provides more protection