STREET PERFORMANCE BALANCERS are the perfect choice for race classes that require an O.E. type balancer. They are also an economical choice for high powered street engines. SFI RACE SERIES BALANCERS bring the advantage of bonded balancers to high revving race and street/ race applications where an SFI approved balancer is required. The steel inertia ring positively protects against forward and backward movement of ten times the force of O.E. non-bonded balancers.