4-3/8" x 5-3/4" ( 4.375" x 5.75" ), 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, 500 Qty / Box, 5000 Qty / Ctn, 5.5 lbs. per Box