Compatibility--Compatible with NIIMBOT B1/B21/B3S portable bluetooth label maker for labeling, please choose the appropriate or compatible label maker to achieve the best printing effect | High Quality--Direct thermal printing technology clear printing. No ink or toner is required waterproof, oil-proof, tearproof, leaves no trace, and BPA-free. Stronger adhesiveness, removed easily, no residue left, you could use it at ease | What you get--One roll of direct thermal labels with size 50 x 30 mm (1.97'' x 1.18''), 230 labels/roll, white label tape, self-adhesive sticker, black and white printouts | Wide Use--B1/B21/B3S replacement labels are widely used in life and work. Suitable for classification, storing, and marking, office organization tags, small business tags, price tags, ingredient tags, reminder tags, and personal item identification, name tags. labeler makers bring you fun and convenience | Notice--The sticker on the side of the label contains a printing sensor chip. Do not remove or damage this chip as doing so will affect the print effect and quality. If you have any questions, please feel free to contact us and we will provide you with thoughtful service