Powerbond Premium OEM Replacement Balancers are manufactured using premium ductile iron castings and injection bonded dampening rubber. Unlike typical original equipment balancers that are made with press inserted dampening rubber, the bonded dampening rubber in the Powerbond Premium OEM Replacement Balancer provides superior bonding strength between the inner and outer balancer rings that minimizes spinning and dislocation in high torque and serpentine belt appplications. With a unique combination of high strength castings, bonded dampening rubber, and dynamic balance, the Powerbond Premium OEM Replacement Balancer is the ultimate standard replacement balancer.