Columbian Envelopes clasp envelopes are the perfect general use mailer for home, office or school. Our gum and clasp closures are a versatile solution for recirculating memos around the office, storing and organizing papers or sending documents in the mail. Gummed flaps provide a permanent seal when you need to keep contents private or send by USPS. Durable prongs and reinforced eyelets keep your inter-office Envelopes circulating use after use. Large 10 x 13 envelopes are perfect for over-sized documents, photos and other mailings you prefer to keep flat without folding. Made of heavyweight 32 lb. Brown Kraft paper to keep contents safe through Many hands and mail bags. Classic open-end style makes for easy loading. Stuff letters, flyers, coupons and other business mailers with ease. 100 per box.