Valve dataSaddle pressure - 38kgLoad - 100kg@12.5mm Max. stroke - up to 13mmMade of chrome-silicone steel SAE9254-VOuter outer diameter of the spring: 30.50mmOuter inner diameter of the spring: 23.20mmInner outer diameter of the spring: 21.20mmInner inner diameter of the spring: 16.20mm16 pcs. outer springs16 pcs. inner springsFits all 4-cylinder VW / Audi 1.8 2.0 16V KR, PL, 9A, ABF, ACE engines. Thanks to this set, the risk of valve vibration and possible engine failure is minimized. Recommended for engines with factory and racing camshafts and revolutions above 7600 rpm. Can also be used with standard or titanium FCP stems.