This sharpener is for a pencil which has chunky pencil functions as a colored pencil, watercolor and wax crayon in one. Perfect for numerous techniques and endless imagination, the extra-thick, 10mm lead provides soft, rich strokes. Outstanding watercolor properties make it ideal for painting with. The highly pigmented, lead is not prone to breakage. It exhibits high luminosity and color intensity even on dark papers. It can also write on smooth surfaces like glass.