Avery Shipping Address Labels, Laser Printers, 1,000 Labels, 2x4 Labels, Permanent Adhesive, TrueBlock (5163) Permanent adhesive 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 bulk shipping and mailing, organizing boxes, bin labels, classroom organization & stickers, filing & organizing, and bottle labels