As a conclusion, it is expensive, but I am satisfied with buying it. The thing that tends to be on the lid of this hand is "distortion", and it will not be able to cover properly when it becomes distorted. However, it uses about half a year, but it does not distort. In other words, there is thickness of plastic itself. (*) Because of the storage location, I pack three boxes and cover the top box only. The box itself is cheaper for the monotaro brand, but since the lid is not sold over there, I will continue to buy more here. * = Depending on the environment of the place of use, we can not guarantee all cases or eternity.