#11 Regular Envelopes (4 1/2 x 10 3/8) - 24lb. Brown Kraft (50 Qty) | Perfect for Checks, Invoices, Letterhead, Letters, Statements | 66464-50 Size: #11 Regular Envelopes / 4 1/2 in x 10 3/8 in / 4.5" x 10.375" / 114mm x 264mm Quantity: Pack of 50 Color: 24lb. Brown Kraft 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.