500 Self Seal Computer Check Envelopes :: Double Window Security Envelopes for Business Checks, Laser Checks, Quickbooks Checks & More :: 3 5/8" X 8 11/16" with Heavy Duty Storage Box by Pinnacle Perfect Fit: Thanks to their slightly wider width, your Pinnacle window envelopes easily accommodate all standard business checks. Checks align perfectly with windows without sliding all around. Stronger Self-Seal: Count on these computer check envelopes for superior peel & seal. Just remove the large adhesive strip & press down the handy flap for a secure seal that won't come loose. Superior All-American Quality: Made in the USA by a respected manufacturer, your premium #8 envelopes feature 24-lb. white wove paper stock, the gold standard for first-class mailings. Ultimate Security Envelopes: Each Pinnacle envelope is tinted inside with a dense, dark, numerical pattern. Rest assured your account numbers & sensitive data will be shielded from prying eyes. Durably Boxed & Fully Guaranteed: Unlike most business check envelopes we've seen, your Pinnacle 500-Pack comes in a strong, sturdy storage box with an easy-open lid. Love it or your money back.