Patent ID: 7749115

Claim:
A bat for striking a ball comprising: an axis; a handle portion having a knob; a transition portion attached to the handle portion; a barrel portion attached to the transition portion, the barrel portion including: an end cap end; a handle end; a barrel length; a first tubular member having a first radius and a first length, the first tubular member longitudinally positioned along the axis between the end cap end and the handle end; and a second tubular member having a second radius and a second length, the second radius approximately equal to the first radius, the second tubular member separated from the first tubular member and longitudinally positioned along the axis between the first tubular member and the end cap end of the barrel portion; and wherein each tubular member includes a center section and two ends, the first tubular member includes a variable first radial stiffness along the first length and the second tubular member includes a second variable radial stiffness along the second length, the variable radial stiffness of each tubular member is greater in the center section than at either end of said tubular member.