Open End Catalog Envelopes, 12″ x 15-1/2″, 25#, White Paper/Poly/Paper, Smooth Finish, Peel & Seal (Box of 500). 12″ x 15-1/2″ (12″ x 15.5″), Open End Catalog Envelope, No Window, Dura Print, White Paper/Poly/Paper, Smooth Finish, Center Seam, Flap Down, Kwik-Tak, 500 Qty / Box, 500 Qty / Ctn, 33 lbs.