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, Diagonal Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 2500 Qty / Ctn, 8.5 lbs. per Box