Universal Window Business Envelope, Side, #10, White, 500/Box Business-weight, 24-lb. stock gives this envelope a professional feel. Wove finish provides a crisp appearance. Fully gummed flap produces a secure seal. Envelope Size: 4 1/8 x 9 1/2; Envelope/Mailer Type: Business/Trade; Closure: Gummed Flap; Trade Size: #10. Fully gummed flap. Manufacturer's limited one-year warranty.Universal