Patent ID: 7011588

Claim:
A bat comprising: a substantially tubular body extending along a longitudinal axis, the body having a handle portion and a tubular impact portion, the impact portion having an inner peripheral surface, the impact portion being formed of a first material; and at least one sheet having a proximal edge, a distal edge, and first and second side edges, the at least one sheet contacting at least a portion of, and extending around the inner peripheral surface such that the first and second edges each extend from the proximal edge to the distal edge along a path that is substantially non-parallel with the longitudinal axis, the at least one sheet being formed of a second material which is different from the first material, the sheet being configured to be capable of moving independently with respect to the body during use, the second material being selected from the group consisting of a metal, a metal matrix composite material, a fiberglass composite material, a urethane and combinations thereof.