1:100% Crucial Dimension,Crack Detection 2:Hardness: 180- 240HB 3:Low noise Standard 1,We may supply or customize over 1000 models of disc brake rotors for most Japanese, European, American and Korean cars 2,100% Crucial Dimension,Crack Detection3,Stable performance &large various models4,Hardness: 180- 240HB5,Low noise Standard brake disc for OPEL