11-1/2" x 14-1/2" ( 11.5" x 14.5" ), Open End Catalog Envelope, No Window, Velpine, White Kraft Paper, SFI Certified, Vellum Finish, Center Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 500 Qty / Ctn, 37.5 lbs. per Box