Spring valve data Spring pressure at the installation site - 38 kg Load - 100 kg @ 12.5 mm Maximum stroke - up to 13 mm Made of chrome-silicon steel SAE9254-V Outer diameter of the outer spring: 30.50 mm Inner diameter of the outer spring: 23.20 mm Outer diameter of the inner spring: 21.20 mm Inner diameter of the inner spring : : 16.20mm16 pcs. outer springs16 pcs. inner springs16 pcs. titanium pins Fits all 4-cylinder engines 1.8 2.0 16V VW / Audi KR, PL, 9A. Thanks to this kit, the risk of valve vibration and possible engine failure is minimized. Recommended for engines with stock and racing camshafts operating above 7,600 rpm. Titanium pins are very durable and light, helping to eliminate valve drift. Their weight is only 10g.