BCW Standard 3x4 toploaders are made of high-quality, rigid PVC. These toploading holders are some of the most popular rigid individual card holders in the collectible card industry. Use this product to protect, store or display collectible baseball cards, football cards, hockey cards, or other trading cards like Magic The Gathering, Pokemon, YuGiOh, and others.</p><p>BCW Card Sleeves (often called 'penny sleeves') are an acid free, archival quality product made of crystal clear polypropylene. Use this protective holder to protect, store and display your collectible trading cards