Our Chromoly Radius Rods are some of the strongest on the market. We use only the highest grade 1.75 .120 wall 4130 for the base of our radius rods. Next we match it up with 4130 Chromoly rod ends we have machined locally. We use left and right hand JMX 5/8 PTFE Lined Heims with Stainless Steel spacers we also have maid here locally in Arizona. Make sure you pair our Radius Rods with our 4130 Chromoly Pull Plate to strengthen the rear of your x3!!