2. The USGA announced that they are going to be very tough in enforcing the rule that the maximum coefficient of restitution (COR) for golf club drivers be 0.83. (some drivers were measured by them as 0.85, this COR gives a drive 5 yards or so advantage over one that is in spec. Assume that the lower spec limit is 0.70) The USGA will allow the upper spec limit on any manufacturers driver to be 0.83 as long as the Cpk is at least 2.0. Ping has developed a very repeatable process for making the driver heads that they believe can achieve a Cpk of 2 with the average COR being 0.828