| 摘要 |
A hollow non-wood baseball or softball bat wherein the impact portion of the bat contains an inner barrel that is positioned by means of a (i) foam insert, (ii) tube extending from the bat's knob, or (iii) line attached to the bat's knob and end cap and extending throughout the bat such that the inner barrel does not come into contact with the inside wall of the bat when the bat is at rest yet when swung the inner barrel is allowed to move so as to amplify the rebound effect given to the ball upon impact with the bat. |
