Descripiton: Durable material the foam rollers have been built with EPP - High Density ,so that they can help you break the stiffness in all your muscles. The foam rollers have been made in such a way that they can handle any adult weight that is placed on them as you try to break the stiffness that is causing your severe back pain. Secondly, the durable material is to ensure that the foam roller serves you for a long time to come. Multi-usage Aside from just self-myofascial treatment, the foam rollers can also be used in yoga. Additionally, physical therapy and massage therapy are two other areas where these can be put to use. Lightweight The foam rollers are lightweight and can easily be carry if you are going for a journey. This allows you to continue your therapy, even if you are away from home. Specificaiton: product name:Back roller massage ball Material: EPP Size: 5PCS:30 * 14cm 24 * 12cm 16 * 8cm 8 * 8cm 15 * 5.3cm 3PCS: 30 * 14cm 16 * 8cm 8 * 8cm quantity:3/5pcs For: men, women, children function:Relax and recover the fascia. Packing list: 3/5pcs Back roller massage ball set Feature: Reduce muscle and joint pain. Prevent injury and muscle pulling. It is very suitable for use before and after exercise. Use regularly to reduce the recovery time of muscle pain and injury. Improve muscle strength, physical activity and flexibility. About Us How to track a package? You can use the waybill number to track the package on the following websites: