Send all types of materials safely and securely in these Office Impressions Clasp Envelopes. The versatile size makes these envelopes great for home, school, or interoffice use. The heavily gummed flap with a sturdy, reusable metal clasp provides extra holding power, and 28-lb brown Kraft paper stock ensures both durability and security. Seam Type: Center; Flap Type: Square; Trade Size: #97; Security Tinted: No.