DIXCEL DISC ROTOR TYPE HS [Compatibility List in Desc.] 1158339S-HSBrand DIXCEL Product Number 1158339S HS Product Description Model Grade:. ML550 4MATIC _x000D_ _x000D_ HS type _x000D_ The high level fusion of stability and brake performance _x000D_ HS type is the high end model by DIXCEL, which demonstrates high performance in all situations from the streets to the race circuit. _x000D_ DIXCEL combined the benefits of both the heat treatment (stability) and slots (brake performance) to create a superior brake disc,