Automatically Disappear Groove Copybook Blue Magic Pen Kit Automatic Fade Pen Disappearing Refill Invisible Ink(5PCS Refil,Black)

Refill color: blue Line width: 0.5mm Name: Automatic fade pen 100% brand new and high quality Length: 14cm Package: 1Set Feature: 1. This product is suitable for students to copy workbook copybooks, do exercises, children's drawing, handwriting will disappear in about 20-30 minutes, disappear without leaving traces, does not affect rewriting, does not affect repeated use of the writing board 2. The fade rate is related to weather temperature and humidity. The ink refill is environmentally friendly, safe, non-toxic and non-polluting. You can slide the new refill back and forth on the eraser before use. Note: 1. There is 2-3% difference according to manual measurement. Please check the size carefully before you buy the item. 2. Please note that slight color difference should be acceptable due to the light and screen. 3. If you need more, please contact us and we will give you a discount. 4.if there are something wrong with the quality, quantity and the type of the product, please fell free to contract our customer service. 5.Thank you for your kindly understanding!