9-1/2" x 12-5/8" ( 9.5" x 12.625" ), Open Side Booklet Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 500 Qty / Ctn, 25 lbs. per Box