In Novak Electronics’ never-ending search to bring the racers the absolute highest quality components and materials, we have found our newest entry into the racing arena─ the Samarium Cobalt (SmCo) Tuning Rotor (#5954). Developed to withstand extremely high temperatures, Novak developed this rotor to retain its core magnet strength over the course of the run so that your motor runs consistently and will not suffer from fade. Braking and throttle response is also more consistent. 
Using SmCo rare-earth materials, this rotor has higher demagnetizing ability than Neodymium, and will increase, and better sustain, RPM under load. This all translates to improved efficiency and added temperature tolerance─all crucial characteristics when you find yourself pushing the limits of racing. Recommended for all applications. 

To view the technical article "Samarium Cobalt (SmCo) vs Neodymium (Neo)", 

FEATURES 
High-strength Samarium Cobalt magnetic material for higher demagnetizing ability than Neodymium material 
Withstands higher temperature tolerance than Neodymium rotors 
Allows motor to run consistently under load over full RPM range with no fading 
Recommended for all applications 
Compatible with all Novak 540-size brushless motors: Ballistic Racing, Ballistic Spec, Velociti Racing, and SS Pro series 
Developed and manufactured to Novak Electronics’ strict standards 
SPECIFICATIONS
Diameter: 12.3 mm 
Magnet: High-strength, Samarium Cobalt 
Shaft Diameter: 1/8”