I purchased it as a spare filter of the 1122R dust mask. I do not know when the replacement time will come, so I think that it will be a little cheaper.
I think that there is no problem if breathing etc. meets the level no problem level specification value. If the price is a bit more affordable depending on the frequency of use, I would like to continue, but if it does not change, I might consider other masks.
Filter replacement is very easy and convenient, so we have purchased repeat. I would like to purchase it as long as you think about a little more cost performance.
The part which corresponds to the face is soft and can be used even if it is used all day but the rubber of the cord has come out and replaced with a new one.