3-15/16" x 7-1/2" ( 3.9375" x 7.5" ), Regular Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Diagonal Seam, Flap Down, Remoistening Seal, Blue Wesco Tint, 500 Qty / Box, 5000 Qty / Ctn, 5.5 lbs. per Box