The BCW 3x4 thick toploaders are designed to hold cards that are thicker than standard trading cards. The phrase 'thicker cards' includes a wide variety of special patch, jersey, swatch, relics, memorabilia, and game-used fragments cards. BCW 3x4 top loading card holders 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 your collectible cards.