#10 Regular Envelopes (4 1/8 x 9 1/2) - 24lb. FSC Certified - White (50 Qty.) | Business | Perfect for Checks, Invoices, Letterh Size: #10 Regular Envelopes 4 ? in x 9  in / 4.125 x 9.5 / 104.775mm x 241.3mm Quantity: Pack of 50 Color: This professional looking white envelope is made from quality 24lb paper and has a smooth finish. Opaque and not see through. Standard Commercial Flap. FSC Certified, this product comes from a wellmanaged forest. The FSC has created a stringently regulated logo system to demonstrate that the paper used has been harvested in a responsible manner. 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.