同时橡胶舌片旋转不同的角度也起到调速作用。
Simultaneously different rotary angles of a rubber tongue piece also play the speed control function.
产品描述：黑色六片帽，三文治舌边，舌板三色贴布，帽身刺绣。
Description: six black cap, sandwiches tongue edge, tongue-colour patch, embroidered cap body.
产品描述：黑色六片帽，三文治舌边，舌板三色贴布，帽身刺绣。
Description: six black cap, sandwiches tongue edge, tongue-colour patch, embroidered cap body.
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