... made of boron iron cast with aluminum penetrated on surface.Cylinder housing is processed by high pressure die casting machine ... sleeve, stability on thermal property.Processed by CNC machine made our products high precision, inner wall of cylinder ... PULSAR, BOXER, etc.) ,TVS, HARLEY DAVISION, VESPA, SYM, China made scooter, LIFAN, HAOJUE, JINCHENG, QJIANG, YINXIANG, BAOTIAN, ZONGSHENG, DAYANG, ...