10" x 10", Square Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Down, Remoistening Seal, 1-7/8" ( 1.875" ) Square Flap, 500 Qty / Box, 500 Qty / Ctn, 22.5 lbs. per Box