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