K15 driver has a larger 460cc head design
The K15 has a larger 460cc head design that moves weight away from the clubface to push the centre of gravity backwards and provide a higher trajectory. By increasing the length from heel to toe Ping have also been able to create a larger surface to provide high levels of forgiveness and higher ball velocity. In reality, the K15 Driver is very much a replacement for the G10 Draw model. Unlike the G15 or I15, the K15 features what PING calls "Straight Flight Technology" or SFT. SFT is PING-speak for "we moved 10% of the total clubhead mass toward the heel of the club". PING has made that extra weight visible via a slight bumpout which is visible on the clubhead.