LUX Paper #10 Regular Envelopes, 4 1/8" x 9 1/2" - Electric Yellow, 500 Pack (4260-20-500) Size: #10 Regular Envelopes 4 1/8 in x 9 1/2 in / 4.125 x 9.5 / 104.775mm x 241.3mm Color: Electric Yellow Quantity: Pack of 500 USES: Checks, Invoices, Letterhead, Personal Letters, Statements, Bills, Flyers. Applications: Business Mailings, Direct Mail, Corporate Mailings, Financial Mailings, Personal Mail. Printable on off-set and digital printing presses and some home printers.