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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.
It is purchase of the second set of eyes. The price is reasonable and easy to use, there is no problem. I do not know about durability because it is not used frequently, but it seems that it is not decreasing so far at the moment.