Valve spring dataSaddle pressure during installation: Intake valve spring - 25 kg, exhaust valve double spring - 36 kg Load: Intake - 56 kg @ 10.5 mm, exhaust - 84 kg @ 10.5 mm Maximum stroke: intake - up to 11 mm, exhaust - up to 12.7 mm Made of chrome steel -silicon SAE9254-V 18 pcs. single intake valve springs12 pcs. double exhaust valve springs18 pcs. titanium intake valve stems12 pcs. titanium exhaust valve stemsFits all V6 2.7 2.8 3.0 30V Turbo/NA Audi / VW engines. Thanks to this kit, the risk of valve vibration and possible engine failure is minimized. Recommended for engines with stock and racing camshafts and revolutions above 7,600 rpm. Titanium valve stems are very strong and lightweight and help eliminate valve drift. Their weight is only 9 and 4 g.