Quality Park 9 x 12 Clasp Envelopes with Deeply Gummed Flaps, Great for Filing, Storing or Mailing Documents, 28 lb Brown Kraft, 100 per Box (37890) REUSABLE CLASP: Designed for repeated use, double prong metal clasp is durable and eyelets are reinforced . Great for home, office, school, interoffice or mailing. BROWN KRAFT 28 LB STOCK: Perfect for everyday home and business use, Quality Park's clasp envelopes are constructed from heavyweight 28 lb. brown kraft stock designed to give contents extra protection during mailing, storage and handling. GUMMED FLAP: In addition to the clasp closure, these Quality Park envelopes have a moisture activated secure seal with deep Gumming on the flap to create a permanent seal. The flaps close with full flap GUM to endure humid climates to ensure the envelope stays sealed so your contents don't fall out! 9 x 12 SIZE: Perfect size for mailing and storing 8-1/2 x 11 sized documents flat when folding is undesirable. PACKED IN 100 COUNT: So many uses means supply is depleted quickly! Conveniently packed in 100 count to reduce frequency of purchasing.