5-5/8" x 9" ( 5.625" x 9"), W-2 Two-Wide Forms Double Poly Window Envelope, Top Window 5/8" x 3-7/8" Window, 5/16" From Left, 3-9/16" From Bottom; Bottom Window 3/4" x 3-7/8" Window, 4-1/2" From Left, 2-1/2" 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, 9 lbs. per Box