550 SELF SEAL Double Window Security Envelopes - Designed for QuickBooks Checks, Business Checks, and Computer Checks - Security Tinted - Peel & Seal - 3 5/8&rdquo; x 8 11/16&rdquo; - 24 LB (NOT FOR INVOICES) IDEAL FOR QUICKBOOKS: designed specifically for QuickBooks users and computer business checksfits 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 BEST VALUE: each box comes with 550 QuickBooks check envelopes, not the standard 50050 bonus double window envelopes included with each order! EASY TO USE: a speed seal flap and ultra-strong adhesive make mailing easysimply peel the strip away press the flap down for a permanent seal that wont rip open or tear while in transit! MAXIMUM PROTECTION: our high-quality security pattern and heavy paper stock protect your numbers, data, and correspondencemail your checks and advertisements with confidence knowing that your sensitive information will remain private