The BCW 500 3 x 4 Card Topload Holders Plus 500 Card Sleeves set is perfect for collectors of trading cards. The set includes 500 topload holders and 500 card sleeves, all made with high-quality materials to ensure the safety and preservation of your cards. The topload holders have a thickness of 12 mil and are open on the top, making it easy to insert and remove cards. The interior dimensions of the topload holders are 2 3/4 x 3 7/8 inches, and they fit standard sized trading cards. The included card sleeves fit inside the topload holders, providing an extra layer of protection for your cards. With this set, you can rest assured that your trading cards will be safe and secure for years to come.