Universal Kraft Coin Envelope, #3, Light Brown, 500/Box This is the ideal small envelope for coins and other valuables. Deeply gummed flap provides a secure seal. Sturdy stock ensures extra protection. Envelope Size: 2 1/2 x 4 1/4; Envelope/Mailer Type: Catalog/Clasp; Closure: Gummed Flap; Trade Size: #3. Sturdy stock ensures extra protection. Manufacturer's limited one-year warranty.Universal