Clasp envelopes give contents extra protection during mailing, storage and handling. They are perfect for everyday home and business use and made from chlorine-free paper stock with a high percentage of recycled material. Designed for repeated use, double-prong metal clasp is durable, and eyelets are reinforced. In addition to the clasp closure, these envelopes have a moisture-activated secure seal with deep gumming on the flap to create a permanent seal. The flaps close with full flap gum to endure humid climates so envelope stays sealed and your contents don''t fall out.