HR RSS Coil Overs are the ultimate high performance suspension with features only found on race cars. RSS include MONO - TUBE shock design for precise control and externally adjustable shock damping. Some RSS Coil Overs feature high - tech light weight aluminum shock bodies that have a black hard anodized finish for beauty and corrosion resistanceHR engineers have spared no expense developing RSS. These beauties feature damping adjustment that simultaneously fine tunes rebound and compression damping for perfect balance and control.