3-1/2" x 6" ( 3.5" x 6"), Poly Window Envelope, A Style Window 1-1/8" x 4-3" Window Size, 5/8" From Left, 7/16" From Bottom, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Diagonal Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 5000 Qty / Ctn, 4 lbs. per Box