A strong trajectory for slugger. Shaft born to pursue strong trajectory and flight distance that many athletes golfer pursues. Firstly, “pursue” the operation performance as much as possible pursued. However, when pursuing flight distance performance which can be caught negatively when importance is attached to operability. For that purpose, use 80 t ultra-high elasticity fiber at full bias, “put on” the ball with a mechanical action. Converts the hard “hit” impact to the distance. “Basileus β (Bashileus beta)” is the best weapon to make it a reality.