Perfect for a variety of applications Ideal for business and professional use. Fully gummed flap provides a strong, dependable seal. Made of crisp 24-lb white wove for a substantial feel. Columbian(R) Business Envelopes, #6, 1/4, 3 5/8in. x 6 1/2in., White, Box Of 500 is one of many Business Envelopes available through Office Depot. Made by Columbian.