These extra-smooth compressed charcoal sticks are versatile tools for artists of all levels. Each stick can be used as is or sharpened with a sharpener or a sandpaper block to achieve many different points and angles. The 2-Stick Sets include two sticks of one degree of hardness each. The 4-Stick sets contain two soft, one medium and one hard stick. The 12-Stick Assorted set includes four each of 2B (Hard), 4B (Medium) and 6B (Soft) compressed charcoal sticks in a handy clam shell package that's great for storage and travel. WARNING: These products contain a chemical known in the State of California to cause cancer.