Heavyweight clasp envelopes offer an excellent solution for accessible storage or filing. Whatever your home or office needs are, clasp envelopes can make staying organized easier. They are great for projects, filing and mailing. Double-prong clasp and reinforced eyelets are durable for repeated use. Envelopes are made of heavy-duty, 32 lb. brown Kraft 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 10" x 15" size fits oversized documents perfectly. Heavy gumming keeps envelopes securely and permanently sealed when needed.