Cobra King RADSPEED Golf Irons – Steel The King RADSPEED Golf Irons are Cobra’s most technologically advanced irons ever. They feature game-changing technologies such as their Radial Weighting Technology and the first-ever 3D Printed Nylon Medallion. Speed and Forgiveness are taken to a whole new level with the Cobra King RADSPEED Golf Irons. Radial Weighting Technology These Irons use radial Weighting Technology to maximise performance. They strategically positioned more mass low on the heel and toe so they could lower the CG while drastically improving the stability of the clubhead. 10g, in the form of a screw, is positioned in the toe and 3g of the mass is positioned in the heel to create the best combination of low CG, high MOI, fast ball speeds, and high launch. 3D Printed Nylon Medallion This utilizes an intricate lattice structure to save weight while providing the ultimate feel. Carbon Fiber Topline This is used to save 2g of weight, lowering the CG and improving launch and spin characteristics. PWRSHELL Technology A forged PWRSHELL Face Insert made of high-strength 17-4 stainless steel.. This allows for a thinner and more flexible face design that increases ball speed on and around the sweet spot.