Full set of 7 shafts for your 4-PW. Born from more than 30-years of innovation and composite shaft mastery, the new MMT Iron utilizes a breakthrough Metal Mesh Technology to redefine the possibilities for performance in a composite iron shaft. Designed to maximize the benefits of both composite and steel performance, our patent pending Metal Mesh Technology represents the very best of the Mitsubishi end-to-end manufacturing approach. As layers of prepreg are stacked to build the shaft's core, a small section of unique Metal Mesh is integrated towards the tip. This Metal Mesh – made up of individually braided strands of 304 Stainless Steel – improves the density and stability of the shaft, while also allowing for thinner overall composite wall construction. Together this yields a finely tuned, highly responsive shaft that still provides the consistent launch and spin control needed for effective iron play.