The partition door which we have used for many years was very heavy due to the wear and tear of the door roller and had trouble opening and closing. I was looking for the same type of product, but it seems to have finished manufacturing, so I was having trouble getting it. I was looking for an equivalent item, this product was found. As soon as the door was adjusted and replaced, it became possible to open and close lightly smoothly as before. Even a grandson of 5 years old can now open and close easily.