Engineered to help you build core strength and flexibility, the SKLZ Slidez Core Stability Discs 2-Pack are made of polyethylene, polyester and EVA copolymer to help ensure a smooth glide on virtually any surface. Featuring nonslip grips for safe use with your hands, feet and knees, the discs' low-friction, nonmarking design, ergonomic tread and unique shape combine to enable multidirectional movement. Integrated fasteners for bilateral training. SKLZ Slidez Core Stability Discs 2-Pack Black/Yellow - Hand Exer. Equip. at Academy Sports