True Pass Alignment for a clear life image against the target. Truss hosel with a Truss design triangle hosel on the head, reduces face twisting during mis-hits and improves ball straightness. 5.9 oz (154 g) BACK WEIGHT: By placing the weight on the back of the head, the mid-sized size but deep center of gravity and high moment of inertia, it demonstrates high tolerance for mis-hits. PURE ROLL™ 2 insert made from a composite of TPU and aluminum. Provides a firm feel and sound while still allowing forward rotation. Truss Sole: The sole design is designed to provide a good sitting experience in all kinds of ways.