This is one of Dr. John’s all-time favorite products. It is an effective, safe and affordable home-use item. It can help lessen neck and upper back pain as well as disc-related problems in the neck. It is used at home for minutes per day. It is simple to set up and use. It causes a gentle, soothing axial traction of the upper spine and also promotes a proper curvature of the neck (known as the lordosis). There are no special tools needed. Money back/satisfaction guarantee. Finally: Please do not purchase the numerous cheap, Chinese “knockoffs/imitators” of this product available on ebay. These knockoffs are cheaply made and are infringe on the legal patents of the doctor (DPT) who invented this product.