Fits thicker patch/memorabilia cards from base products such as Topps and Donruss with standard dimensions of 2.5" x 3.5". The holders are UV-resistant, acid-FREE with no PVC so your cards are safe for as long as you own them. The magnetic card holders are the perfect way to store your collection with minimal touches. Just drop the card in the notched grooves and magnetically seal and your card is secure!