High Performance BM2410-09 840kv (Red/Gold) Brushless Motor without the High Performance Price. Including two prop nuts, one washer and mounting screws. Specifications: * Size: 30x27(mm) * Weight: 62g * Max Efficiency: 80% * Battery: 2-3 Cell Lithium Polymer * Voltage: 7.4 - 11.1 * Shaft Dia: 3mm