Avery Shipping Address Labels, Laser Printers, 25 Labels, Full Sheet Labels, Permanent Adhesive, TrueBlock (5265), White 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 or mailing packages, organizing boxes, bin labels , classroom organization & stickers, printable sticker paper, or creating customized planner stickers.