Fun and functional! Terrific Pocketsâ„¢ are just the right size to hold a generous stack of cards including TREND Pocket Flash Cards and Skill Drill Flash Cards library cards and index cards making them ideal for word walls file folder games sorting and more. Durable acid-free pockets feature high tabs to prevent catching or tearing. 40 pockets 3 1/2 x 5 1/4 . Use with Terrific Index Cardsâ„¢.