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 resistance - HR 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.