Although the size is 28cm, it fits me perfectly, and I usually wear 27cm sneakers, so there's a lot of adjustment room. I saw it on YouTube and was interested, so I used it about 10 times, but I have many other hobbies and don't use it much, so I'm selling it. The rollers spin smoothly, and I think it still has a lot of life left. It's used, so please refrain from purchasing if you are overly concerned about condition.