Open End Expansion Catalog Envelopes, 10″x13″, 40#, Tan/Brown Kraft, Center Seam, Pressure Sensitive Seal (Box of 250). 10″ x 13″ x 2″, Open End Expansion Catalog Envelope, No Window, Roptex, Tan/Brown Kraft Paper, Paper Color: Tan/Brown, SFI Certified, Vellum Finish, Center Seam, Flap Down, Kwik-Tak, 250 Qty / Box, 250 Qty / Ctn, 26 lbs.