Innovators West premium high quality SFI 18.1 certified harmonic balancers are Made in the USA. Highly suggested as a upgraded balancer in any performance engine build, especially when using a turbo or supercharger. All aluminum case design lowers reciprocating weight along with a stress-proof steel hub and 1040 steel internal inertia rings for outstanding durability at high rpm levels. IW uses a light weight billet aluminum cover, but on the inside, a free floating wet friction clutch pack is used to dampen crankshaft harmonics over a wide RPM range. A small amount of fluid is used to reduce heat and friction. Beefcake Racing is an Authorized Dealer for Innovators West, call 1-855-827-7223.