Features: Erasable pen refills, erase and rewrite without damaging the document. 0.5mm full needle refills, wear resistant pen lead, smooth and clear writing. Tungsten carbide pen tip, smooth and stable ink flow, comfortable writing feeling. Add special ink, erase easily with a special eraser, leaving no trace.(Note: Special eraser is not included.) Suitable for study, office, family and examination use. Specifications: Ink Color: Blue/Black(optional) Quantity: 10pcs/20pcs/50pcs/100pcs(optional) Product type: Erasable Pen Refills Pen Refills Length: 13cm Style: Full Needle 0.5mm Note: Use a specialized eraser if you need to erase it. Packing List: 10 * Pen Refills