The original hedgehog balls in first-class quality for targeted use for tension, for stimulating and training the reflex zones, for mobility, gripping and massage exercises, for promoting blood circulation, for strengthening the muscles and for stress relief. In four different, color-specific sizes. Can hold up to around 10 kg. Not suitable for fascia training. Important note: This product is not a toy! The product is a fitness and wellness item and contains phthalates.