... .Process:die-casting 3.Size: Custom High hardness Aluminum Motorcycle Engines cylinder head1.Raw material:aluminum alloy (zinc, magnesium, iron, stainless steel) ... Color:silver white,offwhite,black,etc.4.Processing:die casting,CNC lathes,milling machines,deburring,polishing,spray paint,CMM,spectrometer ... CO., LTD sincerely to cooperate with you! High hardness Aluminum Motorcycle Engines cylinder head