Contrary to popular belief, when it comes to carbon fiber, stiffness and strength are not the same. Often a stiff material is very brittle, and a strong material is not very stiff. This makes shaft engineers develop a combination of multiple materials to try and dial in ideal strength and stiffness properties for a certain shaft and creates tradeoffs when trying to design a lightweight, stable shaft that delivers maximum energy transfer. This is where Hexcel's most advanced HexTow carbon comes in: iM10.