The Fortress Smooth n Spikey Massage Balls really are the greatest self-massage tool on the market. Packaged in a box with two choices, you get the option to use a Smooth or Spikey Massage Ball. We were even surprised at just how good this massage tool is. This item is perfect for those who lead a busy lifestyle and constantly suffering from those little aches and pains that occur due to muscle tightness and muscular fatigue.