Clasp envelopes feature deeply gummed flaps for permanent secure closure. They are great for storing or mailing documents. Heavy-duty, double-prong clasp and reinforced eyelets are durable for repeated use. Envelopes are made of 28 lb. stock that is great for extensive handling as well as mailing. Contents are protected during use to give you assurance that it arrives unharmed. This product ships in approximately 1 days