No. 10 business envelopes feature double windows and a security tint to secure your documents. Top window is 1″ x 3″, 1/2″ from the left side and 2-1/2″ from the bottom. Bottom window is 1-1/8″ x 4″, 1/2″ from the left, and 3/4″ from the bottom. Design also features a white wove material, side seam and gummed seal. 24 lb. #10 (4.25″ x 9.5″) – 24lb – Gummed – Wove – 500 / Box – White