4-1/2" x 6-1/2" ( 4.5" x 6.5" ), Professional Statement Poly Window Envelope, 1-1/4" x 4" Window, 3/4" From Left, 1-3/4" 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, 5 lbs. per Box