Avery White TrueBlock Technology Laser Shipping Label 3-1/3" x 4" Box Of 600, these White Shipping Labels with TrueBlock® Technology make deliveries easy. These bright white labels completely block out any writing underneath so your boxes and envelopes have a neat and professional appearance every time. And they work with most popular shipping software. They're also great for personalizing to use on gifts, homemade goodies, party favors and more. Easily customize the labels using our free designs and templates at Avery Design & Print Online. Add your logo, graphics or other images to create a one-of-a-kind package. Then print and ship. These versatile labels can help make all your shipping and mailing a breeze.