4-1/8″ x 9-1/2″ (4.125″ x 9.5″), Regular Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Down, Kwik-Tak, Blue Wesco Tint, 500 Qty / Box, 2500 Qty / Ctn, 7 lbs.