The Pure 2Improve Foot Massage ball. The size of the P2I Foot Massage Ball is great to relieve aches and pains in nerves and muscles. Relieve foot aches and pains with the Foot massage ball. The unique surface helps stimulate circulation, increase mobility and target small muscle groups to aid in recovery, and is ideal for targeting small muscles through deep tissue compression massage. It is portable, water resistant and easy to use.