Our Billet Trailing arms are machined in house from a Solid block of 6061 Billet AluminumPerformance Benefits:- Eliminates Rear axle deflection on and offroad by replacing soft OE bushings with Trophy Truck Grade uniballs- More rear axle Articulation Durability Benefits:- Our Solid Billet design will not bend, dent or deform: When an OE Upper link or Trailing Arm is damaged from harsh use or striking a rock the following can occur: - Rear end is thrown off center and truck will drive crooked down the road/trail - Rear pinion angle is is thrown out of alignment and creates a driveline vibration in truck - Built in Skid replaceable skid plates let you slide over rocks without damaging the arm itself Aesthetics Benefits:- They look Awesome! - The highest quality machined parts designed and manufactured in California - Eye catching from under the truck ro replace the boring OE tube arms