#10 Open End Envelopes (4 1/8 x 9 1/2) - 80lb. Bright White (50 Qty) | Perfect for Checks, Invoices, Letterhead, Letters, Statements | 7535-50 Size: #10 Open End Envelopes / 4 1/8 in x 9 1/2 in / 4.125" x 9.5" / 105mm x 241mm Quantity: Pack of 50 Color: 80lb. Bright White USES: Checks, Invoices, Letterhead, Personal Letters, Statements, Bills, Flyers. Applications: Business Mailings, Direct Mail, Corporate Mailings, Financial Mailings, Personal Mail. Printable on off-set printing presses and some home printers.