LUX #10 All Purpose Window (4 1/8 x 9 1/2) 50/Box, 24lb. White w/ Sec Tint (WS-3133-50)

When sending letters, invoices or statements, save the time and expense of separately addressing envelopes. Simply position the address to show through the window, or choose our full-face windows, which are large enough to show off the entire contents. Available in a variety of styles and colors, printed or plain.