Quality Park Postage Saving Window Envelopes - Booklet - #10 1/2 - 9 1/2in Width x 6in Length - Gummed - Paper - 500 / Box - White

White heavyweight paper, inside tint and large flap with extra adhesive for secure mailing 500 / Box Holds extra documents and provides value based on shape-based postage costs Reduce postage costs by changing from a flat mailer to a letter-rate size Size: 6in x 9-1/2in