5-1/2" x 7-1/2" ( 5.5" x 7.5" ), Open End Catalog Envelope, No Window, Western Sulphite, White Kraft Paper, SFI Certified, Vellum Finish, Center Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 2500 Qty / Ctn, 7.5 lbs. per Box