Green No 10 Envelopes are great for mailing letters, checks, invoices, statements, contracts, advertising materials, and more. Use for everyday business mailing, special occasions, or for personal use. The Gamma Green Astrobright envelopes will definitely get noticed in the mail. To use, insert your item, moisten the seal, and press to close. The envelope can easily fit standard size documents (8 1/2 x 11-inch) folded into thirds. Powered by ExportYourStore.com