SKLZ Slidez Fitness Equipment : For a strong, stable body a solid core is extremely important. The SKLZ Slidez core stability discs are the functional tools you need to strengthen this area of the body. These low-friction discs are designed to slide on virtually any surface to help build a strong score and increase flexibility. Features: 1-Year Limited Warranty. Integrated fasteners clip together for bilateral training. Unique shape reinforces omnidirectional movement.