Ahhh what should I measure? That's a golden question, but in this case I think I have the answer. See this is a simple injection molded plastic part and from a practical point of view $50-100 is a lot of money because I work in an industry that uses injection molded plastic parts and yes they don't even cost that much. Because of this, you will read a number of reviews where people complain that the prices are too high. But in this case you are paying for the design and personally I have no problem with that because it is an AMAZING design element. There is no other product that can do what this one does. This is the BEST lower back/glute relaxation tool you can buy. Period. The spacing between the "arms" and their geometry reach places that are difficult to reach even with a deep tissue massage by a professional, especially in a prone position. The space between the arms also serves to contract and expand around the spine as you bear your weight on it. For me the price you pay is a unique product that does what no other self massager can and I think is worth it. If you don't feel a difference when you do this, you're probably not using it properly.
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