My son had a very serious accident while using his pogo stick. The rubber end had worked it's way up from the end of the stick and when my son started to jump on it the pogo stick slid out from under him and he fell and smashed his head onto the concrete. We found him laying in a pool of blood, screaming. We rushed him to the emergency room to have him examined. He suffered a severe cut on his lip, which required stitches. He also suffered a concussion, and lost his two front teeth. What a sad thing to have happen... this all happened Saturday October14th. We are going to contact the company on this matter with hopes of them doing somthing about the rubber ends. I would not buy this pogo stick due to the rubber end. I found it interesting that there was another person which wrote about the same thing in the comment section of this web page... I would say they were lucky enough to find the rubber end was bad before one of their children were hurt seriously like my son. This pogo stick was purchased at Toys r Us.