Spring valve dataSaddle pressure installed - 38kg Load capacity - 100kg at 12.5mm Max. lifting - up to 13mmMade of chrome-silicon steel SAE9254-VOuter diameter of the outer spring: 30.50mmInner diameter of the outer spring: 23.20mmOuter diameter of the inner spring: 21.20mmInner diameter of the inner spring: 16.20mm8 pcs. of external springs8 pcs. of internal springsFits all 4-cylinder engines VW/Audi 1.8-2.0 8V Thanks to this set, the risk of valve vibration and possible engine failure is minimized. Recommended for engines with factory and racing camshafts operating above 7600 rpm. Can also be used with standard or titanium FCP valve retainers.