5-1/2" x 8-1/4" ( 5.5" x 8.25" ), 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, 8 lbs. per Box