These 1970-81 Camaro & Firebird tubular upper control arms are designed to improve performance and handling. Added caster improves high speed stabilty and reduces road wander. These control arms are absolutely the best on the market. Helps to correct camber and ball joint angle problems. Designed with an extra 4.0 degrees of caster into the arm to make the vehicle drive straight and true while also improving camber curve.. Control arms come black powder coated, and are fitted with high performance Delrin bushings and factory ball joints, ready to install in your chassis. Lower control arms are large diameter 1020 DOM tubing.