The Matrix Golf Ozik HD6 golf shaft is truly a superb feat of construction. It's weight around 62 grams but still manages a low spin right rate and a low/mid launch angle. It's also torqued down to 3.2 degrees, giving that low torqued feel, which is uncommon in a shaft below 80 grams that also maintains a low/mid launch angle.
The HD in HD6 refers to the hexdecagonal internal platform on which the shafts are constructed. With a much strong 16-cut butt section, the Matrix Golf HD6 has a stronger tip and structure without increasing weight.
