Product Description This wooden-cased colored pencil features a core made of "Frixion ink," which disappears with friction, solidified with wax. The friction generated by rubbing the eraser on the back of the pencil over the writing allows you to erase the marks cleanly. You can easily correct mistakes when coloring or drawing. Because the marks become colorless with friction, there are no eraser shavings, and you won't dirty your desk or table. Please check the second image for usage examples. Thank you for viewing.