Label Specifications: 38x25mm round labels/stickers for NIIMBOT B1, B21, B31, and B4 label printers, with 260 labels per roll, printed in black on white. High-Quality Printing Technology: Clear and sharp prints without ink or toner, thanks to direct thermal printing technology. The labels are waterproof, oil-resistant, tear-proof, and removable without residue. Versatile Use: Perfect for home, small businesses, and schools, ideal for various applications such as name labels, price tags, and return address stickers. Automatic Label Recognition: Equipped with a smart identification chip for immediate recognition by the label printer, eliminating the need to manually search for templates. Important Note: Ensure that the sticker with the print sensor chip on the side of the roll remains intact to guarantee print quality.