Defender Standard Card Sleeves — often called “penny sleeves” — are your first line of defense for collectible trading cards. Whether you're sleeving rookies, foils, or vintage pieces, these sleeves are designed to protect your cards from fingerprints, dust, and surface wear during handling and storage. Made from crystal-clear, acid-free polypropylene, each sleeve offers archival-quality protection without clouding or scratching your cards.