4-5/8" x 8-7/8" ( 4.625" x 8.875" ), Open Side Dual Purpose Mailer Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Side Seam, Flap Extended, Remoistening Seal, 500 Qty / Box, 2000 Qty / Ctn, 13 lbs. per Box