7pcs/set Blue Ink Automatic Fade Pen Kit Refill Ink Disappearing Pen Calligraphy Magic Pens School

Label:Yes Line width: 0.5mm(0.02in) Package: 1Pen with 6Refills Refill color: blue Name: Automatic fade pen Length: 14cm(5.51in) 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 refill back and forth on the eraser before use.