Increase your muscle flexibility, accelerate muscle recovery, reduce muscle soreness and muscle tension in just a few minutes after application! Lightweight and easy-to-use ball-shaped foam roller for deep tissue massage (self-myofascial relaxation) The ultra-high density foam material (EPP) makes our foam roll products significantly stiffer than any other product on the market. Higher material density increases exercise intensity. Although sturdy, these Body Massage Balls are strikingly light and their compact size of approximately 8 cm (diameter) makes them portable and easy to carry. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.