My 2 year old cats LOVE these and carry them around like they're proud of their find. They also like to fetch them. If I've slept too long, they'll even bring me a ball because it clearly is time to play. These two also think it's great fun to drop their toys in their water but this set of balls bleeds. After reading again that the dye isn't toxic, I'm still concerned and would stick with the natural colors when I buy again.