Ideal for smooth, realistic black and gray shading, The powerful motor comes with custom winding that has built-in give, specifically designed to offer artists a softer, more realistic hit. We've designed it as a very short pen style machine to give a feel like its just only the grip in Your hand. Ideal for smooth, realistic black and gray shading, The powerful motor comes with custom winding that has built-in give, specifically designed to offer artists a softer, more realistic hit. We've designed it as a very short pen style machine to give a feel like its just only the grip in Your hand. Specifications: Weight: 144g Stroke: 3.5MM Motor: Brushless motor Working Voltage: 5-12 V Speed: 12V/9000Rpm Grip Diameter: 33MM Length: 93 MM