Ink-free printing: The chemically treated, heat-sensitive paper turns black when a direct thermal printer applies heat to it. This means you do not need to buy or replace expensive ink, toner, or ribbon cartridges. Strong adhesive: The labels are self-adhesive with a permanent, acrylic-based adhesive backing that sticks securely to most surfaces, including cardboard, plastic, and film. High print quality: Despite being ink-free, the labels produce clear, crisp, and dark prints with a smooth, matte finish. Standard size and roll count: The 50mm x 25mm labels are typically supplied in rolls of 1,000 stickers. Easy to use: The rolls are designed for hassle-free installation in most thermal printers, with the individual stickers easy to peel and apply.