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 mmLength: 16.5 mmShaft length: 6.3 mmShaft diameter: 0.8 mmWeight: 2.5 gSpeed: 50000 rpmRated voltage: 3.7 VRated current: 100mAWire length: 50 mm