ONE WITH TWO PERFECT CURVES - FITS ANYONE NEEDS! It would exacerbate pain if you stretch in the wrong curve. With the US-patented C-shaped curve, Mazori neck Stretcher - cervical traction device added extensions at the bottom like a shark tail, which perfectly conforms with the natural cervical spine, better relieving pressure on the nerves and disc. And the concave and convex design makes it more available. The convex side provides gentle traction while the concave side provides strong stretch.

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