Quality Park #8 Double Window Envelopes are designed to fit QuickBooks and other computer generated checks. These check envelopes have careful window placement to show only the sender and receiver addresses while check amounts and other data remain private and protected. This slightly wider envelope comfortably accepts wider laser check formats from QuickBooks without extra folds or dog-eared corners. For privacy, our security envelopes have a reflex blue tint with safety pattern to prevent prying eyes from reading sensitive information, even when held to light. You won't miss licking the gummed seals on basic check envelopes. Our Redi-Strip self seal envelopes are a tidy, timesaving upgrade — just peel and press for a durable seal. 24 lb white wove paper with side seams give Quality Park envelopes a professional appearance. These bright white safety envelopes are suitable for all sorts of confidential business mailings. Stock up and get more for your buck; bulk boxes of 500 security envelopes are made for high volume envelope users. Ideal for accountants, law offices, or any workplace or small business that moves large volumes of mail. Envelope dimensions are 3-5/8 x 8-11/16 inches overall. Top window measures 7/8 x 3-1/2 inches, 3/8 inches from the left and 2-3/8 inches from the bottom. Bottom window measures 7/8 x 3-1/2 inches, 7/8 inch from the left and 3/4 of an inch from the bottom.