The scope of air neckcushion application.It is suitable for cervical vertebra spondylosis air neckcushion Structure and compositionAir neckcushion are mainly made by inflatable balls (with valves), gas-guide tube,gas cut-off valves, chamber, bushings, inflatable mouth, neck care and velcro.According to the different gas chamber, air neckcushion can be divided into three layer, four layer, five layer Colour option of neck air cushion tractor: 1.royol dark blue 2.fashion cute rose 3.decent nice brown 4.elegant purple 5.decent black