3-5/8" x 8-5/8" ( 3.625" x 8.625" ), Regular Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 2500 Qty / Ctn, 6 lbs. per Box