Aluminum back RIGHT upright CNC-machined from premium Swiss 7075 T6 aluminum. Designed & recommended for in high-traction conditions. Increases back stability. Features additional top roll center positions for fine tuning. Roll center height may be adjusted making use of shims between upright and upper website link. Wheelbase range happens to be increased and may be modified within a selection of 4mm. Also black colored coated and laser etched.