Columbian #10 Single-Window Security Envelopes fit computer-generated invoices and business statements. The window is precisely sized to show only the receiver address, keeping your recipient's personally identifiable information concealed. Single window measures 1-1/8" x 4-1/2" and is positioned 7/8" from the left edge, 1/2" from the bottom. For QuickBooks, Quicken and other laser printed invoices and business statements. Security envelopes have a privacy tint and a complex security pattern. Both help obscure the appearance of letters and numbers. Keeps social security numbers and private data hidden, even when held to light. Too busy to wet-sponge your way through stacks of mail? Affordable Release & Seal self seal envelopes don't require moisture. Just peel, press and go. The peelable paper strip protects the adhesive from dust so your blank envelopes last longer in storage. Side seam business envelopes make it easy to print logos and other information on back without folds and creases getting in the way. These number 10 envelopes are made from sturdy 24 lb white wove paper. The perfect letter sized envelopes for all your business needs. Each #10 Envelope measures 4-1/8" x 9-1/2" inches. 500 Per box.