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