Maxi-Backsie - An excellent device for massaging the spinal column. This is the descendent of the original Ma Roller which was developed over 30 years ago. The new rubber rings stabilize the rolling action making it easier to control your movements. By giving a gentle stretch to the spine and a deep massage to the antigravity muscles in the back, the Maxi-Backsie stimulates three fundamental lines of energy known to every ancient culture around the world. These three lines represent the very core of the man - both conscious and unconscious functions. This device has been recommended by knowledgeable doctors and chiropractors for many years now. Maxi-Backsie Specifications: 15 inches x 2 1/2 inches