Compressed carbon bars: Different diameters can better meet your paint needs, and you can achieve a different sharpness of the carbon bars by friction. The coal bars are soft and comfortable, easy to color, durable and can be used for a long time time. Compressed graphite drawing pencil: including 2 soft coal bars, 2 medium coal bars and 2 hard coal bars, can meet different paint requirements. Drawing sticks: high quality selected coal bars , cooked at high temperature, will not be easily broken. The color can be changed from light to dark according to the pressure applied during use.