Quality Park Business Envelope, Side Seam, #10, White, 250/Box Cost-effective solution for bulk mailing. Wove finish adds a professional touch. Gummed flap provides a secure seal. Envelope Size: 4 1/8 x 9 1/2; Envelope/Mailer Type: Business/Trade; Closure: Gummed Flap; Trade Size: #10. Gummed flap.Quality Park