3-9/16" x 5-9/16" ( 3.56" x 5.56" ), Baronial Envelope, No Window, Ultra-White, Bright White Sulphite Paper (96% Brightness), SFI Certified, Vellum Imaging Finish, Diagonal Seam, Flap Down, Remoistening Seal, 500 Qty / Box, 5000 Qty / Ctn, 3.5 lbs. per Box