The TriggerPoint GRID Ball?? combines the benefits of a massage ball and foam roller into compact and targeted muscle pain relief. With a lightweight and portable size, the design aids in targeting tight hips, shoulders and back muscles for relief and recovery at home or on-the-go. Made of high-density EVA foam which provides moderate compression for a premium self-massage. Signature GRID pattern channels blood and oxygen as you roll?. The GRID Ball is a convenient recovery aid for use anywhere, at any time to help release muscle tightness and improve flexibility. Weight: 1.9 oz.. Diameter:?5 in.?. Imported.