Avery Permanent Shipping Labels with TrueBlock Technology, 5292, 4" x 6", White Pack Of 20 - It's quick and easy to create your own customized labels with these Shipping Labels featuring TrueBlock technology. They're great for shipping and mailing, as well as for gift tags, homemade treats and more. With our TrueBlock technology you can cover up everything underneath the label, letting you reuse boxes, while offering a bright white professional appearance.