The #10 Window Envelope (4 1/8 x 9 1/2) in 24lb. Bright White is a rich, white standard weight envelope great for everyday business uses. Never spend time individually addressing letters, invoices or statements again – just position the address on a document to show through the envelope window and you’re ready for action. These top quality envelopes are sealed by a moistenable glue located on the inside of the back flap. #10 Window Envelopes are available both plain and custom printed for company branding and creative uses, starting in small quantities of 50 to large quantities of 50,000 and more.