Synergy Manufacturing Heavy Duty Fixed Rear Lower Control Arms are intended for the Jeep JK, and they are made with Synergy Dual Durometer Bushings (DDB). The DDB construction weaves in a Teflon bearing surface that delivers many great performance attributes while cutting down maintenance requirements. The 1 3/4" X .188 Wall 1026 DOM tubing is crush resistant, and covered in a powder-coated finish intended to curtail corrosion. 1/2"; longer than stock parts, the arms achieve additional ground clearance by being bent upwards. Bolt-on parts makes installation a breeze.