Ok this tool is called the Backnobber. The ones you cn find from the site I listed below only have knobs at the ends. I have on from a health food store that has atleast ten knobs along the body of the apparatus and I love that one. I also have the original Backnobber II that I can snap into two pieces so it's easy to travel with it. I typically need one spot on my neck attended to when I travel so I often travel with only 1/2 of that toy.