5-1/2" x 8-1/8" ( 5.5" x 8.125" ), Announcement Envelope, No Window, Ultra-White, Bright White Sulphite Paper (96% Brightness), SFI Certified, Vellum Imaging Finish, Side Seam, Flap Down, Remoistening Seal, Packaged in a Rigid, Non-Collapsible, Wrapped Box, 250 Qty / Box, 2500 Qty / Ctn, 4.75 lbs. per Box