4-1/8" x 9-1/2" ( 4.125" x 9.5" ), Poly Window Envelope, Showcase Window 2-5/8" x 7-1/2" Window Size, 1" From Left, 3/4" From Bottom, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 2500 Qty / Ctn, 7 lbs. per Box