This clasp envelope is made of 110 gsm brown kraft paper. Each envelope has a two-prong metal clasp in the center of the opening, ready to give extra security for closure. The flap has a pre-punched hole in the center, perfectly lined up with the two-prong metal clasp. It also has pre-applied adhesives that are dried and will be ready to stick when moisture is applied.Details: BrownAvailable in multiple sizes100 envelopesKraft paperSize information:6" x 9" (15cm x 23cm)9" x 12" (22cm x 30xm)10" x 13" (25cm x 33cm)