Rigid Self Seal Pre Printed "Do Not Bend" Fiberboard Photo/Document Mailers, 12.75 x 13.25 Inches, Box of 25 -White fiberboard shipping mailer features a Redi-Strip self-adhesive closure -Pre Printed front and back with ?PLEASE DO NOT BEND? -Extra-rigid fiberboard Protects photos yet light weight of 2.7 oz. per mailer to save on postage. -16 point CCKB Board for a Bright Glossy Professional Appearance. -EZ Tear system for retrieving Items