This is the Flux Warp 5700Kv Brushless Motor from HPI Racing. Powerful, high-speed brushless motor Excellent pairing of huge power and extraordinary efficiency Same size as standard 540-size motor Sleek black-anodized aluminum casing Zero maintenance design External solder tabs for easy wire replacement Oversized precision ball bearings for long life High Torque/ High Temperature Neodymium rotor Slotless stator design delivers smooth, linear torque Easy 4-point mounting for convenient installation Longer run times than a comparable brushed motor Easily rebuildable with bearings and rotor being user-replaceable Compatible with any sensorless ESC One Flux Warp 5700Kv Brushless Motor Installing in vehicle and connecting to speed control Can Length: 52.4mm (2.06") Can Diameter: 35.75mm (1.4") Shaft Length: 14mm (0.55") Shaft Diameter: 3.15mm (0.12") cnh 2/13/09 ir/jxs &