5-3/4" x 8" ( 5.75" x 8"), W-2 Double Poly Window Envelope, Top Window 7/8" x 3-1/4" Window, 7/16" From Left, 3-9/16" From Bottom; Bottom Window 1-1/4" x 3-1/4" Window, 7/16" From Left, 1-3/4" From Bottom, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Down, Remoistening Seal, Blue Wesco Tint, 500 Qty / Box, 2500 Qty / Ctn, 8.5 lbs. per Box