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