Valve springs data Installed seat pressure - 34kg (75lbs) Load - 63kg@10mm (140lbs@10mm) Max lift - up to 12mm Made from chrome-silicon steel SAE9254-V BMW - 2.0 16V Turbo B48B20 With this set the risk of valve flutter and a possible engine failure is minimized. Recommended for engines with series and racing camshafts and over 7500 RPM. Kit includes: 16 pcs. conical valve springs 8 pcs. titanium retainers 5mm 8 pcs. titanium retainers 6mm