for both type parquet floors

The hard castors damage the floating floors with time. In addition, we were jammed or was equipped with a braking device prevents the chair from rolling if we were not sitting on it. this is no practical doubt when the office floor is sloping but it annoyed me there. With these wheels "simple", I do not deteriorate the floor and my chair rolls easily and silently.
Warning, check the diameter of the pin wheels before you buy. There are 10mm, 11mm and it seems to me that we can find the 9mm.