| 摘要 |
A bat includes a composite material barrel. The barrel includes a plurality of layers. A stiffening layer forms one of the exterior layers of the barrel. The stiffening layer includes unidirectional fibers, where the unidirectional fibers are oriented to substantially encircle the barrel. The stiffening layer is positioned on the barrel to cover at least a portion of the sweet zone. The barrel may include multiple walls, where each wall includes a stiffening layer.
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