Type:Brushless Size:Replacement for 370/400 Bearings or Bushings:Bearings Recommended Prop Range:10x4.7-12x3.8 Voltage:7.2-12 RPM/Volt (Kv):740 (rpms per volt) Resistance (Ri):.26 ohms Idle Current (Io):.55 @ 10V (no load current) Shaft Diameter:1/8 in (3.17mm) Overall Length:1.15 in (29mm) Weight:56 g (2.0 oz) Overall Diameter:1.10 in (28mm) Diameter:1.1 in (28mm) Continuous Current:7A Maximum Burst Current:10A Cells:6-10 Ni-Cd/Ni-MH or 2-3 Li-Po Speed Control:10-20 amp brushless