Item Type: Back Stretching Device Material: ABS 1MULTIFUNCTIONAL MASSAGE: Back stretcher can be used as a multi level lumbar support stretcher spine, back massager, shoulder massager, shiatsu massager, back massage chair, back massage car. 2STRESS RELIEF: Waist stretching device is ergonomically designed to relieve pressure. Suitable for chronic lumbar support, herniated disc, sciatica, spinal stenosis and etc. 3ACUPUNCTURE: Back cracker brings acupuncture effect through deep pressure on specific acupuncture points to promote blood circulation and help you relax tension in the lumbar spine and back. 4EASY STRETCHING: Back cracking device can be fixed in the most comfortable position for easy stretching. The higher the multi?level adjustment back stretcher, the more you stretch. 5APPLICABLE SCENES: Back stretching device is made of premium ABS, lightweight but sturdy, perfect for use at home, office chair, gym, in the car or on a yoga mat. 2 x Plastic Plate 1 x Sponge Pad 1 x Instruction Book