12" x 15-1/2" (12" x 15.5" ), Open End First Class Tyvek Catalog Envelope, No Window, Tyvek, Tyvek Paper, Paper
Color: Bright White, Smooth Finish, Center Seam, Flap Down, Kwik-Tak, Printed Green 1st Class Border, 500 Qty / Box, 500 Qty / Ctn, 19 lbs. per Box