Features: High Purity Copper Windings Double ball bearing, speed balanced and low noise Replaceable high quality low resistance carbon brush from Removable/replaceable structure, easy to cleanand maintain Specifications: Brand: KingVal Type: 550 3-Slot Voltage(LIPO):7.4V Shaft dia: 3.175mm Motor dia: 35.9 mm Weight: 211g Turn:CCW 550 3-Slot 12T Turns:12T No-load current:<2.4A No-load PRM:26000±12%RPM Plugging current:18.9-82.4A Torsion:≥2301.4 g.cm 550 3-Slot 14T Turns:14T No-load current:<2.2A No-load PRM:23000±12%RPM Plugging current:13.7-76.4A Torsion:≥2670.0g.cm .