Feature:1. Erasable pen refills, erase and rewrite without damaging the document.2. 0.5mm full needle refills, wear resistant pen lead, smooth and clear writing.3. carbide pen tip, smooth and stable ink flow, comfortable writing feeling.4. Add special ink, erase easily with a special eraser, leaving no trace.(Note: Special eraser is not included.)5. Suitable for study, office, family and examination use.Specification:Features:Erasable pen refills, erase and rewrite without damaging the document.0.5mm full needle refills, wear resistant pen lead, smooth and clear writing.carbide pen tip, smooth and stable ink , 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 RefillsPen Refills Length: 13cmStyle: Full Needle 0.5mmNote:Use a specialized eraser if you need to erase it.Packing List:20 * Pen RefillsPackage List:20 * Pen Refills