AFX Yellow IRL AFX9439 Pick-Up Shoes: High conductivity Phosphor Bronze ? Gets more power to the motor. Guide Pin: Exclusive extra long tapered design (only AFX has it!) ? Keeps the car in the slot longer. Ground Effects Magnets: Neodymium rare earth magnets ? Holds the track like nothing else. Nylatron Chassis: Super durable with just enough flex to keep from breaking on those big impacts. Precision Balanced Armature: Revs to the moon ? reliably! Cantilever Commutator Motor Brushes (only AFX has it!): Makes the motor