Lunati's aluminum roller rockers are extruded from premium aircraft heat treated aluminum alloy for maximum strength, then CNC machined to exacting tolerances for long lasting performance, before being tumble polished to reduce stress risers. Lunati then installs needle bearing trunnions to withstand the high valve spring forces found in many of today's street and race engines. Linati roller rocker arm are anodized blue for long lasting good looks and the lunati name and rocker ratio are laser etched into the body for easy identification and to let everyone know the best aluminum roller rockers are in your engine.