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: 144gStroke: 3.5MMMotor: Brushless motorWorking Voltage: 5-12 VSpeed: 12V/9000RpmGrip Diameter: 33MMLength: 93 MM