With the spikes on the fascia ball, you can easily find sore spots in your body, and focus the massage on just the right point. The spiky ball stimulates blood circulation, relieves muscle tension and helps remove toxins from the body. Regular massage will keep your muscles soft, improving mobility and flexibility. Individual sizes are specifically designed to target different areas of the body. Suitable for use on the soles of the feet, back, thighs and neck, for example. Massage balls can be used before or after training. The lightweight massage balls are easy to carry with you in the training bag. The balls are made of PVC, which can withstand body weight.