Brand New 500 Count #8 Double Window Envelopes SELF SEAL Business Mailing 3 5/8" x8 11/16" DOUBLE WINDOWS, IDEAL FOR QUICKBOOKS: Designed specifically for QuickBooks users and computer business checks—fits all QuickBooks and computer business checks perfectly; dual windows placed in an ideal location for checks, business mailings, and advertisements PREMIUM QUALITY: Our window envelopes feature thick 24 lb. paper, a superior adhesive seal, and a high-quality security pattern QUICK SEAL ADHESIVE: Simply peel the strip away press the flap down for a permanent seal that won’t rip open or tear while in transit SECURITY TINTED ENVELOPES, MAXIMUM PROTECTION: Our high-quality security pattern and heavy paper stock protect your numbers, data, and correspondence—mail your checks and advertisements with confidence knowing that your sensitive information will remain private BEST VALUE: Each box comes with 500 envelopes.