I and my dog LOVE these! Previously she would only go for tennis balls which are a nightmare as she's really worn her teeth down. I've tried every make; Kong, The Dogs Balls, Hyperpet, Chuckit tennis balls etc. None lasted and none were soft on her teeth as claimed. It took a bit of me bouncing this one around and not letting her have it to make it prize procession, but now it's as love as tennis balls. It doesn't harm teeth, is so far indestructible and my dog is a heavy chewer, it bounces magnificently and is lightweight. Really relieved and impressed.