* Do not use or keep the product under the sun or in a high temperature. The core becomes colorless when it comes to 60 degree or higher.*Do not use for writing official document * The erased handwriting might be visible in -10 degree. Do not use other than drawing and writing on paper. * May not be suitable to erase depending on the type of paper* The core of colored pencil is soft, if become easy to brake if you over sharpen. Pay attention when using a mini sharpener. The color may become faint if you write with high pressure.
(Axis) wood, with rubber for erasing / (core) friction ink
Even if I make a mistake, it is very useful as it can be cleanly erased. It may be a good idea to have only one core a bit harder, but even if it is so, I love it because it can be cleaned out. I hope the price is also cheap.