| 摘要 |
<p>There is provided a ball for sports in which an air injection valve (2) attached to a rubber innertube (1) is covered by outer layers (7,8,4) so as not to be exposed. An aperture (6) for insertion of an air injection needle is provided in the outer layers (7,8,4) so that it is in alignment with the hole (5) for insertion of an air injection needle of the air injection valve (2).</p> |
