📬 Seal the Deal with Style! Top-quality envelopes by Next Day Labels™ Sender and receiver addresses visible! Made from 24 lb. white wove paper! Durable and secure flip-and-seal flap! Designed for QuickBooks and more! 8" x 5" size Security tint Pack of 500 NextDayLabels offers a box of 500 #8 self-seal double window security check envelopes, designed for a perfect fit with checks printed on popular software like QuickBooks. Featuring a durable self-sealing flap and a security tint to conceal sensitive information, these envelopes are crafted from high-quality 24 lb. white wove paper, ensuring professionalism and security for your financial transactions.