Spring Valve Data Installed Pressure - 40 kg (88 lb) Load - 100 kg @ 12 mm (220 lb @ 12 mm) Maximum Travel - Up to 13 mm Made of SAE9254-V Chrome Silicon Steel 24pcs Dual Valve Spring Fits for BMW M3 - 3.2 24V (S54B32) This set minimizes the risk of flutter valve and possible engine failure. Recommended for engines with original camshafts and racing engines operating above 7,500 rpm. Can be used in combination with original supports and seats.