The BCW Penny Card Soft Sleeves come in a pack of 5 with 100 sleeves in each pack, totaling 500 pieces. These clear sleeves are made of polypropylene material and are compatible with standard-sized cards measuring 2 5/8 x 3 5/8 inches. The soft sleeves provide a protective and transparent way to store and display trading cards, making them ideal for sports memorabilia enthusiasts and collectors.