6×9 heavyweight clasp envelopes are thick & opaque; serves double duty for sorting or sending private papers; envelopes have double prong metal clasps, reinforced eyelets & gummed seals These sturdy small envelopes are manufactured from extra heavyweight 32 lb. brown kraft envelope stock for extra privacy and 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 6 x 9 mailing envelopes are perfect for sending small documents or booklets in the mail flat without folds or creases; extra heavyweight envelopes are ideal for organizing or mailing private documents An excellent value; get 100 heavyweight brown kraft 6×9 envelopes at a stock-up price