One of the materials utilized in the new ATTAS Speed Series is Aerospace grade T1100G which basically helps the shafts stability and stiffness, so the shaft doesn't feel like a "noodle" when you hit it. The shafts are then ensured with the M40 High Performance 40T Material that helps to stabilize the shaft in key point areas. The ATTAS Speed Series shafts are the perfect combination of ultra lightweight performance with precise control and feel. Each shaft is manufactured using a precise combination of exclusive high modulus carbon fibers and toughed resin systems to achieve optimum performance.