Rigid polypropylene card dividers with index tabs to organize your card collection. They fit fully in all standard-sized ULTIMATE GUARD card cases and boxes. 10 dividers per pack. Rigid polypropylen The high quality and rigid material keeps your dividers durable and strong, even after many uses. Write-on index tab Convenient write-on index tabs that help you keeping track of your cards and organizing your collection. Acid free - No PVC This product is completely free of PVC and acidic materials and therefore ideal for collectible cards. 100% archival safe Keeps your cards safe and preserves the value of your collection during permanent storage.