Thank you for viewing. This is the Hayabusa Zero jump rope, supervised by Ninja Nine, a group that runs the "Yaruki Switch" learning program. It's designed to help children who are not good at jump rope learn to jump. I bought it when I started taking Ninja Nine classes. I used it once in the classroom, but haven't used it since, either inside or outside. Please understand that this item has been stored by a private individual, so please purchase only if you are comfortable with that.