CHRA Balancing Test: <0.5Mg.mm / 150000RPM Shaft wheel material: K418+42CrMo Compressor wheel material: C355 for normal or 2126 for billet Bearing Housing material: HT250 Gray Iron and high Ni for shift link arm Back plate material: ADC12 YL102 or Iron for some big models. Nozzle ring material: K418 Thrust bearing material：Brass Bar Fluorine Gum O-ring material: Fluorine Gum Thrust collar material: 42CrMo Piston Ring material: W6+ 3Cr13