Heavy-duty clasp envelopes feature an open-end style, reinforced clasps, and deep gumming on flaps for a secure seal. Metal clasp with rounded edges is plated for rust-resistance. Large flap and superior gumming secure documents inside. 28 lb. #63 (6.5″ x 9.5″) – 28lb – Clasp – Kraft – 100 / Box – Brown