91551 #9 Double Window Confidential Envelope Size: 8 7/8 x 3 7/8″Save time – no addressing! Tinted inside pattern keeps confidential information from showing through.   Quality paper stock! 24# bright white wove stock enhances your professional image. Gray Security Tint Recipient’s address and your preprinted return address show clearly through 2-window DU-O-VUE design. No need to hand-address or print envelopes. Mailed with peace of mind: Tinted inside pattern keeps confidential information from showing through. Quality construction stands up in the mail. Gummed flap seals securely when moistened.  Top window: 4″ x 1″; 3/8″ from left, 2 1/4″ from bottom Bottom window: 4″ x 1″; 3/8″ from left, 1/2″ from bottom 250 per box