This is a domestic manual cervical spine massage instrument. the roller design can adjust the roller direction at will according to the massage needs. it is elastic and not easy to break. it is soft and elastic, which can better stimulate the acupuncture points to relax the cervical spine, the humanized handle is more comfortable to use. if you sit in front of a computer for a long time and keep still, i recommend that you buy it. applicable parts: shoulders, neck, arms, legs, etc. suitable for the whole body. highly recommended.â