The KBs are designed by Kim Braly (you may not know him by name, but if you ever played a Project X shaft, then you know his work). Apparently according to KBS:
- By reducing the mass and radius of each step in equal proportions along the shaft’s center line, the KBS Tour shaft delivers optimum stability resulting in efficient energy transfer from the player’s hands to the clubhead. In addition, the KBS Tour shaft incorporated step-by-step Moment of Inertia analysis to reduce shaft ‘interference’ during a player’s well-executed swing.
I also swapped out my Dynamic Gold wedge flex shafts in my 54, 58 and 61 deg wedges for the new Aerotech Steelfiber i125g graphite in a stiff flex. These shafts are amazing, with a little more feel than the steel, and definately a flatter flight. The clubs are balanced out at right between D5 and D6, which again is about a swingweight lighter than I am used to.
So far they all seem incredible, but will continue to see how they perform.