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Due to the national holidays as Golden Week, we will close 2018/4/28~2018/4/30 and 2018/5/3~2018/5/6.
This may cause delays with our responses. Thank you for your understanding.
If it is an iron bearing, it will rust in about two months and it will be unusable, but if it is made of stainless steel it will be rust free and can be used for a long time, so the exchange frequency will be less.