2-1/4" x 2-1/4" ( 2.25" x 2.25" ), Open Side Lens Envelope, No Window, Western Sulphite, White Sulphite Paper, SFI Certified, Vellum Finish, Center Seam, Flap Extended, Ungummed, 1000 Qty / Box, 10000 Qty / Ctn, 2 lbs. per Box