4-1/8" x 5-5/8" ( 4.125" x 5.625" ), 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