Business Source Heavy-Duty Clasp Envelope. (9 1/2″ x 12 1/2″) – 28.00 lb – Clasp – Kraft – 1 box–100/Box – Brown SKU: BSN36663 Heavy-duty, 28 lb. Brown Kraft with clasp Reinforced-metal clasp with rounded edges is plated for rust-resistance Open-end style construction with large flap and deep gumming for a secure seal