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. • Heavy-duty 28 lb. Brown Kraft. • Reinforced-metal clasp with rounded edges is plated for rust-resistance. • Open-end style construction with superior gumming on flap for a secure seal. • Sold as 100/Box.