Adult FriXion Colored Pencils that disappear when rubbed [Features] These colored pencils are incredibly clean with friction heat. Can be used for professional adult coloring and drawing. The rich color lineup allows for a variety of expressions. Equipped with a solid core using unique FriXion ink, which disappears when temperatures exceed a certain temperature. Rub the drawing surface with the special erasing rubber on the back of the pencil, the ink will become colorless due to the friction heat generated. There is almost no eraser residue, and no eraser is used. The shaft is made with wood shaft, and the herringbone pattern that looks like it protruding from the surface of the shaft for a comfortable grip, slip-resistant and luxurious feel. The multi-color set case is made of a high-quality tin case with excellent durability. FriXion is an erasable writing instrument. Please do not use for diplomas, addresses, or anything that needs to be removed. Do not use or store in a location that is exposed to the sun or high temperatures. The lead will become colorless when the temperature is over 60 degrees Celsius. Erased brushes may return if the product is within -10 degrees Celsius. Do not use for drawing or writing other than paper. Depending on the type of paper, such as thermal paper, or the characteristics of the print may be unsuitable for erasing. Rub the eraser rubber with dirt on it, and the paper surface will become dirty. Please wipe off any dirt before use. The core of the colored pencil is soft, so if you remove it too much may cause it to break the lead. When using a mini sharpener, please insert straight and shave slowly, especially when using a mini sharpener. Quick even with pressure applied