9″ x 12″, Open End Catalog Envelope, No Window, Velpine, White Kraft Paper, Paper Color: White, SFI Certified, Vellum Finish, Center Seam, Flap Down, Multi-Tak, 500 Qty / Box, 500 Qty / Ctn, 22 lbs. Open End Catalog Envelopes, 9″ x 12″, 28#, White Kraft, Center Seam, Multi-Tak Seal (Box of 500).