DM2215 Outrunner Brushless Motor is made by high-tech material, advanced designing technique, delicate manufacturing technology and strict testing method. Its advantages are high efficiency of electro-magnetic conversion, high torque, low running noise, long working life, etc. Specification: Weight: 55g Outside diameter: 27.7mm Length: 32.3mm Spindle diameter: 3.0mm Propeller: 10x4.7 (optimum) Number of cells: 3 Li-Poly Working current:: 10.5A (continuous running) Rotation rate (with prop): 6500RPM RPM / V: 850RPM / V