A must have for the track. Brake lever guards block any unwanted objects from crashing in to your brake lever. A sudden stab of the lever could lock up the front wheel or cause you to endo. Many race organizations require them.
The main body is CNC'ed billet aluminum and the protective part is made of a special plastic. The mixture of materials allows for best performance in flexibility and durability. The lever guard portion is replaceable in the event of a crash.