The space between the two balls allows a targeted and effective massage – particularly around the spine, calves, quads – improving the flexibility and performance of the muscles. Effective relieve back pain and stiffness with soft yet dense silicone material. It is durable for long lasting use. 130mm in length and 66mm diameter, weight in 400 gram. This split peanut shaped massage ball is a perfect design to get to those harder to reach stabilizing muscles that surround your spine and vertebrae without applying pressure on them as you lay on it. The massage ball is made of 100% silicone, which is firmer than the tennis ball, but not like the hard plastic balls with knobs and hurt. It is durable for long lasting use 5 colors have the same density for choice. 130mm*66mm N.W：400g JF066 ME-SF
