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Although our old set was also from Comp, we couldn't help but splurge a bit when it came to upgrading to newer and stronger rollers. The most noticeable difference is the nearly unbreakable 8650 chromoly body. The arched, weblike design delivers a nearly 29 percent increase in strength and rigidity. A black-oxide exterior finish looks cool while ensuring long-term corrosive resistance. They also feature unique hardened roller tips for reduced friction and eliminates valve stem side-loading. The Ultra rocker arms also feature a fully rebuildable design. We installed our set and locked them down with the supplied hardware.