The Mlikero Card Protector 500 Penny Sleeves are designed to hold standard-sized trading cards securely in place. With soft sleeves and an acid-free plastic material, these clear Protector sleeves are perfect for protecting and displaying your Pokémon and baseball cards. The 91mm x 66mm size is ideal for standard card thicknesses, with a capacity of 1 card per sleeve. This product offers 500 sleeves in total, ensuring you have plenty to store and protect your valuable card collection.