Features: 1.Removal by Friction: These refills contain thermal ink that disappears by friction when the eraser is used (please wait until the ink is completely dry before erasing). It leaves no room for mistakes and keeps the page clean and tidy. 2.Erasable Gel Refill: With the eraser (not included), the thermal ink disappears by friction, leaving no residue and no tearing of the paper; removing the mistakes you've just written on. 3.Safe and Durable: The erasable ink refills are water-based, non-toxic, acid-free, non-staining, heat-eraseable, durable and safe to use; you can share them with your colleagues. 4.Applications: These neutral ink refills are compatible with most neutral ink pens and are perfect for use in books, greeting cards, stamping, diaries or school notes. 5.After-sales Service: If you have any problem, please contact us immediately, we will help you solve it as soon as possible. Specifications: Single Length:50mm Single Capacity:0.9ml Inner Diameter:3.4mm Warnings: Exposure to extreme temperatures or direct sunlight may cause the ink to disappear as it is temperature sensitive. These refills are not recommended for use on exam paper, legal or official documents. Include: 10 * Thermal Erasable Ink Capsules or 100 * Thermal Erasable Ink Capsules