1. Panjang topenglingkaran telingaharus cocok, terlalu pendek akan mencekik telinga, dan perkakas akan tidak pas;
2. The material of the mask earloop must be elastic: the mask lingkaran telinga is made of spandex + nylon: because this material has high comfort, good elasticity, and does not hurt the skin;
3. Mask lingkaran telinga should be round and flat: usually mask ears have round and flat ears. According to the different masks, choose the appropriate ear straps, such as Purking lingkaran telinga. The regular specifications are complete and can be customized.