The driver with highest CT is Integra Sooofar cast titanium driver with a measured CT value of 311 to 313. he USGA has limited the CT (Characteristic Time) to 239 microseconds, this is the amount of time there is contact between the clubface of a driver and the ball at the moment of impact. The Integra Sooofar cast titanium driver exceeds the USGA limit by 25%.