4-1/8″ x 9-1/2″ (4.125″ x 9.5″), Flip-Stik Poly Window Envelope, C Style Window 1-1/8″ x 4-1/2″ Window Size, 7/8″ From Left, 1/2″ From Bottom, Western Sulphite, White Sulphite Paper, Vellum Finish, Side Seam, Flap Down, Pres-Stik, Blue Inside Tint, 500 Qty / Box, 2500 Qty / Ctn, 7 lbs.