Combined with the lightweight body Inspiring focus. Steadiness and precision. Combined with the lightweight body and super low center of gravity. You will be sure to have a firm grasp on your machine.Tested lots of times then make this special custom coreless motor for this machine operating mechanism. Specifications: Motor Speed:7.5v/10000Rpm Stroke length:3.6mm Weight:150g Working Voltage : 5-8v Custom coreless motor 7.5v/10000rpm