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Material: Stainless SteelX2 steel valves are a direct descendant of the Xceldyne full race titanium valves. Increased flow over stock valves. Optimized for weight reduction. Specialized high performance steel alloys specific to the intake and exhaust valve. Oversized kits available. Designed to work with X2 or Xceldyne premium full race components. Designed specifically for the off-road enthusiast. Available as single units or in various kit forms including the valves, springs, retainers,locaters, and locks.This item fits the following vehicle applications:Honda CRF450R 2002-2006Honda CRF450X 2005-2006Honda TRX450ER Electric Start 2012-2014Honda TRX450ER Electric Start 2006-2009Honda TRX450R 2006-2009