Muscle Relief Ball

*Dia : Ø 47 mm
*Roll this unique ball under your feet, in your hands,
  or over and sore and tired muscles.
*160 Knobs provide smoothing stimulation that will
  immediately begin to relax and eliminate tension.
*You can control the depth of massage with
  applied pressure to ensure the utmost relief
  of muscle soreness.
*Small enough to fit in handbag, sports bag,
  briefcase or desk drawer; this easy-to-use massage
  ball is great for use any where, any time.