Our card sleeves are manufactured from premium, non-PVC, acid-free polypropylene (PP) material. This ensures full archival safety, meaning your cards are protected from discoloration, moisture, and long-term damage. For B2B buyers, we also offer customization in thickness (60–120 microns) to meet different trading card requirements such as Pokémon, MTG, and sports cards. By using non-toxic and recyclable material, we comply with international standards like RoHS and REACH, making them suitable for global distribution.