Pendaflex Expanding Kraft File with Flap, Jan.-Dec. Index, 12 x 10, 1 per Box (K-17M-OX) Essentials Kraft indexed expanding files with double thick front and back panels, Tyvek reinforced gussets and preprinted dividers. Double thick front and back panels stand up to active use. Gusset tops are reinforced with Tyvek tape to prevent ripping and tearing. Preprinted dividers. 7/8" capacity per pocket.