9 x 12 Open End Envelopes - 11lb. Tyvek (50 Qty) | Perfect for mailing Documents, Catalogs, Direct Mail, Promotional Material, Brochures and More | PC1102PL-50 USES: Catalogs, Annual Reports, Brochures, Magazines, Invitations and so much more! Applications: Business Mailings, Direct Mail, Corporate Mailings, Financial Mailings, Personal Mail. Size: 9 x 12 Open End Envelopes / 9 in. x 12 in. / 9" x 12" / 229mm x 305mm Printable on off-set printing presses and some home printers. Quantity: Pack of 50 Color: 11lb. Tyvek