3-3/4" x 6-3/4" ( 3.75" x 6.75" ), Regular Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Diagonal Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 5000 Qty / Ctn, 5 lbs. per Box