将环形磁铁嵌入橡胶圈的内腔中，再将塑料罩盘盖在橡胶圈的背面。
The annular magnet is embedded into an inner cavity of the rubber ring, the plastic cover disk is covered at the back face of the rubber ring.
将环形磁铁嵌入橡胶圈的内腔中，再将塑料罩盘盖在橡胶圈的背面。
The annular magnet is embedded into an inner cavity of the rubber ring, the plastic cover disk is covered at the back face of the rubber ring.
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