Features - Available in 6cm, 7cm, 8cm, 9cm & 10cm. Easy To Clean. Suitable for Massage, Reflexology, Yoga, Pilates. Yoga Studio Spikey Massage Balls are the perfect tool for releasing tight, uncomfortable muscles, relieving tension and pain. This can either be done by Self-Massage, or by getting a partner to roll the Spikey ball in the affected area.Spikey Yoga Massage balls are a very effective way to release toxins caught in the body and they improve the blood circulation around your body.To use - simply roll the ball over the affected area with your hands.For self massage on the back; place the ball against the wall and you back, simply move from side-to-side or up and down.Back Massage; another great method is to sit on a desk chair and place the Spikey ball between you and the back of the chair. Leave it there and adjust the position ever 5 minutes - from lower back to higher back.