Different from what I thought
I thought these spikey balls were a hard rubber but it appears that it is plastic...at least the black one is.  But they work just the same.  I have back, neck and hip pain.  I use these mostly on my feet - like a reflexology.  They give me relief both in my feet as well as my calfs.  The other balls are great when you lean up against a wall.  Was using 2 tennis balls tied in a tube sock but they are not as effective as the ones in this kit.  I'm not that flexible so the back wand (that's what I call it) is a bit too short.  If it were a bit longer it would be more helpful.  I'm satisfied with my purchase.
Rating: 5 stars