With the simple system stacking aid are the Wegrollende exercise balls of the past. Quick and easy, the Aufgeblasenden balls can easily be stacked and creates a piece of cake order in practice room. The stacking aid is completely stable and is made of hard plastic with bolt and nut fixing. For additional storage of these balls is not secure installation needed and can be flexibly in the room. Perfect for therapy in practices, Hebamme practices, fitness studios, schools and clubs.The stacking aid is ideal for exercise balls and fitness balls in the following sizes: 45 to 85 cm.