Safely Print onto our #10 Single Digital Window Security Envelopes, Laser Safe Quickly and easily send hundreds of business invoices, bill statements, and checks with our #10 envelope design and cost effective gummed seal with thick permanent adhesive. The heat resistant window film in our digital envelopes are safe for use in laser printers in your home or office, saving you the hassle of return address labels or professional printing Unlike standard #10 window envelopes which will melt or warp in hot laser printers, our digital envelopes are designed to withstand heat and can be safely used in any type of home or office printer Business mail will be completely secure during transit It can be so difficult to find envelopes that create a strong lasting seal thus forcing you to waste time using glue sticks or tape to close the envelopes. Our single window envelopes with strong adhesives are designed to immediately create a strong seal so you do not have to worry about your contents being exposed to others. Unlike weak sealing envelopes that allow your contents to fall out and become exposed, So much for a security envelope, our strong seal will ensure the safety of your contents. Durable 24 LB white wove paper creates a professional look and feel from out of the box all the way to your destination