The Ultra PRO Card Preservers Resealable Hybrid Card Holder Semi Rigid 50 Count Pack is a set of toploaders made of clear plastic that can hold standard-sized trading cards. The holders are resealable and acid-free, ensuring that the cards are protected from dust and damage. The semi-rigid design provides extra protection while still allowing for easy insertion and removal of cards. The pack includes 50 toploaders, making it a great value for collectors.