"Clasp Envelope, #15, Square Flap, Clasp/gummed Closure, 4 X 6.38, Brown Kraft, 100/box | Bundle of 5 Boxes"

Designed for repeated use, double prong metal clasp is durable and eyelets are reinforced. Constructed from heavyweight 28-lb stock designed to give contents extra protection during mailing, storage and handling. Feature a moisture activated secure seal with deep gumming on the flap to create a permanent seal.