It mainly used in small-scale aircraft, it's incredible that such a small motor can provide power 5W and running the speed at 50000rpm on 3.7V. It's only 2.5g weight can effectively reduction the weight of the aircraft . 　 Specification： Diameter: 7 mm Length: 16.5 mm Shaft length: 6.3 mm Shaft diameter: 0.8 mm Weight: 2.5 g Speed: 50000 rpm Rated voltage: 3.7 V Rated current: 100mA Wire length: 50 mm For any technical support or suggestion, please kindly go to our forum.