Some lots have miswritten in the product packaging. (False) ZEBRA Gem Knock 0.7 Lead / (True) ZEBRA Gym Knock 0.7 Lead We are deeply apologized and corrected by the relevant people. A wearable note with a silicone band that wraps around your arm. You can write with an oil-based ballpoint pen and wipe it off with your fingers or eraser, but some pens may leave marks even if you erase with an eraser, and they may not be disappeared with alcohol. Do not use Mitsubishi Pencil Jetstream as it may have compatibility issues and leaves traces. We recommend using ZEBRA Gym Knock 0.7mm lead for a ballpoint pen. Designed for workers at the forefront of the field with the aim of "Anytime, Anywhere, Write Anywhere, Remember". Can be used without disappearing if it gets wet. Cannot be used with pencils or water-based pens. Erase with eraser after use. If there is any residue, please wipe it with alcohol within 24 hours. / Ink may bleed onto the band over time. / If there is still a trace, please wipe it with alcohol. Product color, specifications, and product packaging may change without prior notice. Winner of numerous awards, including the Japanese Stationery Award, Function Division Awards and Good Design Awards.