Great item, These Components are made in Michigan for Comp Cams (Comp Cams does NOT make there own valves springs nor Cam Cores), There springs are made in Michigan and are then packaged up in a exspensive Comp Cams box, Comp Cams also do NOT produce there own Cam Cores, They however grind there own Cam Grind programs, Harley Davidson (Screaming Eagle Cams are ground to Harley's Patented Specs by Comp Cams, Valve springs are also supplied to Harley Davidson by Comp Cams,