the WEIRC chassis is made of stainless steel. it comes with the screw set included in the price! Steel chassis' provide increased rear stability as well as increased initial steering and a more consistent steering arch through the corner. the WEIRC steel chassis are NOT made with the same process that the Awesomatix steel chassis are made and both chassis are of a different material. the WEIRC chassis flexes very similarly to the Awesomatix chassis providing the benefit of a steel chassis at a fraction of the cost. SuperStock is still testing this chassis and will provide an indepth assessment and comparison soon.