4-3/8" x 5-3/4" ( 4.375" x 5.75" ), 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, 4.5 lbs. per Box