The set of 100 rigid mailers made of cardboard, measuring 6.5″ x 4.5″. These self-sealing envelopes are white in color and are suitable for everyday mailing. The mailers are made in China and are perfect for securely shipping photos, documents, and other items. With their durable material and convenient self-seal closure, these envelopes provide a reliable and efficient way to handle your mailing needs.