These #10 Window Machine Insertable envelopes are made for automatic insertion. 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.Size: 4 1/8 x 9 1/2Color: WhiteQuantity: 50/PackUse these envelopes for all your mailing needs that require a single face window.Keep these in your home office, or work office, they will absolutely come in handy!