Columbian #8 Double Window Envelopes are custom built to fit QuickBooks and inkjet generated checks. Careful window placement shows only the sender and receiver addresses while check amounts and other data remain private and protected. This slightly wider envelope comfortably accepts the somewhat wider laser business checks format. We promise you won't miss licking laser check envelopes or those drippy moistener sponges in a cup. Redi-Strip self seal envelopes bring your mailings into the modern era with a tidy, clean alternative to standard envelopes. Just peel and press for a durable seal. Plus, the peelable strip protects your adhesive from dust so envelopes last longer in storage. Our security envelopes for Quickbooks checks have a reflex blue tint with safety pattern to protect sensitive information; shields contents from prying eyes, even when held to light. Columbian business envelopes are made of 24 lb white wove paper with side seams to create bright, professional envelopes for mailing. Available in boxes of 500 to quickly stock your workplace, small business or home office. Envelope dimensions are 8-11/16 inches x 3-5/8 inches overall. The 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. 500 per box.