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Chalk Box
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可以吸到带金属夹层的黑板上使用，收纳粉笔用。一格款很浅，放用过的粉笔头用。二格款吸力和摩擦力最高也最实用。需要另外购买直径10x4mm强磁铁（三格款需要4个，二格款需要6个，一格款需要4个），其中二格款如需增加摩擦力，可以另外在背部粘贴15mm宽1mm厚的带背胶硅胶垫。
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