W775 Double Window Envelope Size: 8 5/8 x 3 5/8″ Be extra-efficient when paying invoices with the Double Window Standard Seal Business Envelopes – W775, featuring windows for both the address and return address areas. Gummed flap seals securely when moistened. Quality paper: Crisp 24# white stock ensures a professional appearance. Top window size is 3 1/2 x 7/8″  1/2″ from top and 5/8″ from left. Bottom window size is 4 x 1″  5/8″ from bottom and 5/8″ from left. 5/8″ between windows. 250 per pack