Big Skinny Women's RFID Blocking Slimvelope Tri-Fold Checkbook with Purple Interior, Holds Up to 40 Cards, Graphite Cobble Ultra-thin checkbook wallet with two billfold/checkbook areas; external full-size zippered pocket 6 extra-wide card pockets hold up to 40 plastic cards; two ID pockets with a clear plastic windows Pockets lined with layer of RFID blocking material & a rubbery coating to prevent cards from sliding out Constructed of thin, light, and durable nylon microfiber; machine washable Measures 7.5 x 4 x 0.27 inches