These shock Shafts start with the highest grade forged ultra alloy material and are precision centerless ground and machined to absolute tolerances and finish specifications using CNC machines. The threads are then roll formed, instead of cutting in the threads for the highest strength threads possible. We didn't stop there and found the highest grade Shaft coating known to mankind - Black Diamond DLC coating, which creates a much harder surface than standard Ti-Nitride Shaft coatings and delivers a 10 times smaller coefficient of friction for the smoothest shock action that has ever been achieved. Features: Precision Centerless Ground and Machined to Exacting Tolerances. Threads Roll Formed instead of Cut for Ultimate Thread Durability. High Strength Ultra Alloy Material. Black Diamond DLC Shaft Coating. Highest Ever Surface Hardness for RC Shock Shafts. Lowest Ever Friction and Stiction for RC Shock Shafts. 10 Times Smaller Coefficient of Friction Compared to Ti-Nitride Coating. Same Exact Coating Technology found in Formula 1, NASCAR & Factory MX Bikes.