Because I needed a number, I put it in a box, but it was a failure. There are too many things that can not be used, such as stiff, unopened objects, things that break down when forcibly opened, things that are hard to open, hard to open, etc.
I think that it is making firmly. There are 2 to 3 defective products among 100 pieces. Those in which the two semicircular fasteners are twisted and are not looped, those which were not separated from each other in the first place. Although it does not bother to replace it, it is better to ask more than the number of uses.