4-3/8" x 5-3/4" ( 4.375" x 5.75" ), Baronial Envelope, No Window, Ultra-98, Bright White Sulphite Paper (98% Brightness), Vellum Finish, Diagonal Seam, Flap Down, Remoistening Seal, 250 Qty / Box, 2500 Qty / Ctn, 2.75 lbs. per Box