9×12 clasp envelopes serve double duty for sorting or mailing; heavy-duty kraft envelopes have double prong metal clasps, reinforced eyelets & gummed seals; great for home, office, These sturdy large envelopes are manufactured from heavyweight 28 lb. brown kraft envelope stock for extra protection in mailing, storage and handling Gummed seal envelopes have a thick strip of adhesive activated by moisture; use an envelope moistener for a strong, sanitary seal 9 x 12 mailing envelopes are perfect for sending large lay-flat items without folds or creases; perfect for contracts, catalogs, registration packets, 8 x 10 photos and more An excellent value; 100 brown kraft 9×12 envelopes at a stock-up price