No. 10 envelopes with a window require no moisture to seal. Simply peel back strip and fold closed. Protective strip keeps adhesive free from dust. 1-1/8″ x 4-1/2″ window is positioned 7/8″ from left and 1/2″ from bottom. No. 10 envelopes are security-tinted for privacy of contents and made of 24 lb. white wove stock. #10 (9.75″ x 4″) – Peel and Seal – Wove – 500 / Box – White