|  This set uses rollers to brake MS and FM-A chassis cars if the nose comes too far off the track, slowing the car slightly and getting it back in shape. 
- Smoke color polycarbonate. 
- Paired with two low-friction POM 8mm rollers (White) to provide the brake effect. 
- Small parts for attachment included. 
- Compatible with MS and FM-A chassis cars.  |