Preparing for the release of a new set? Considering upgrading the protection of your vintage card collection? The 500 pack of BCW Card Sleeves is an efficient and convenient solution for storing and protecting your cards in bulk. BCW Card Sleeves (often called 'penny sleeves') are an acid free, archival quality product made of crystal clear polypropylene. These protective holders are perfect for your collectible trading cards such as: baseball cards, basketball cards, football cards, hockey cards, Pokemon, Magic The Gathering, and others. ★ Fits inside topload card holders ★ Protect cards while handling.