The Ozik TPHD is an exceptionally high quality shaft featuring Interply hybrid technology combined with HD internal structure. The "HD" Design refers to the hexadecagonal (16-sided) internal platform on which the shaft designs are built. HD allows for new levels of structural strength. With the stronger 16-cut butt section, Matrix engineers are able to better structure and strengthen the tip section without adding overall weight. At times this even lowers balance points to better match high MOI and low CG heads. The result is a stronger "tip-strength-to-weight" ratio than with any previous Matrix shaft.