Use for Back Material Plastic, Acrylonitrile Butadiene Styrene Specific uses for product Pain Relief Product dimensions 40L x 3W x 25H centimetres Product benefits Pain Relief Water resistance level Waterproof [Effective & Best Gift] - Made of fine quality ABS plastic, pressure resistant, compact and portable design can nicely put into the luggage. The back massager is designed to stretching your back, easily, safely, affortable and enjoyable. This machine was small, lightwieght, equiped with multi-level back stetching devise, which can help you to relax and instantly relieve back pain due to tight muscles, excessive flexion, and poor spinal alignment. An intimate gift for family and friends. [88 Massage Protrusions] - Equiped with 88 massage protrusions, corresponds your body acupuncture points, massages your lumbar spine while stretching - help to relieve chronic back pain. [3 Different Levels] - Three different levels can be adjusted, provides you better massage. You can just lie down and relax for five minutes twice a day. Ease back pain, improve posture, increase range of motion and flexibility. You can use it while sitting, help you to correcting your sitting posture and massage your lumbar spine. Improves flexibility in shoulder and back muscles. [Soft Rubber & Multi-level Adjustment Arch] - With soft rubber mat in the middle, cushion impact force, give your waist better protection. Multi-level adjustment arch for greater reach. Simple and user friendly, adjustable and portable, you can use anywhere you want.