UltraHold permanent adhesive sticks and stays securely on cardboard envelopes paper glass or metal. Avery address labels won t lift curl or fall off like other brands. Quickly and easily create your own personalized labels. No more jams or smudges with Avery shipping labels. Bright white labels are optimized for laser printers so you can effortlessly print bold bright colors and clear sharp text. Easily and efficiently create your own personalized labels with these Avery Shipping Labels with TrueBlock technology. Our TrueBlock technology lets you cover up everything underneath the 3-1/3 x 4 labels so you can reuse boxes and block out markings and mistakes for a polished professional appearance on the bright white labels. This 600 bulk pack of shipping labels is fantastic for high-volume shipping and mailing jobs as well as for creating custom labels for gift tags crafting party favors and more. These address labels are optimized for laser printers so you can easily print lush colors and crystal clear text without worrying about printer jams or ink smudges. You can also effortlessly personalize your printable labels with logos graphics or images using the free shipping labels template and designs on the Avery site.