Avery Shipping Address Labels, Laser Printers, 400 Labels, 3-1/2 x 5, Permanent Adhesive, TrueBlock (5168) Permanent adhesive is guaranteed to stick and stay put on cardboard, envelopes, paper, glass or metal. No more jams or smudges with Avery shipping labels. White labels optimized for laser printers. TrueBlock technology covers up everything underneath the shipping label so you can reuse boxes. Easily customize these printable labels with thousands of free templates and designs at avery.com/templates. Great for shipping and mailing, organizing boxes, bin labels, classroom organization &amp; stickers, filing &amp; organizing, beer bottle labels and wine labels.