Perfectly fits QuickBooks Checks, or other computer printed checks: checks will slide in easier with a slightly wider design than a standard 8 5/8 envelopeChecks amounts and memos will not be visible: Only addresses will show through our unique double window design with no need to change QuickBooks settingsProvides complete check security: your checks will be hidden with our security tint designJust Flip Flap and Seal to create a strong lasting seal: Our self seal design is quick and easy and is guaranteed to stay sealedMaintains professional look and feel throughout transit with our durable 24 LB white wove envelope paper