Southworth 25% Cotton #10 Business Envelope, White, 24 lbs., Wove, 250/Box, FSCUse coordinated stationery to make a strong, professional impression. Business-weight, cotton fiber blend stock appears and feels sophisticated. Gummed V-flap produces a secure seal. Acid- and lignin-free. This product was made from wood sourced from a certified managed forest. Envelope Size: 4 1/8 x 9 1/2; Envelope/Mailer Type: Business/Trade; Closure: Gummed Flap; Trade Size: #10.