INCLUDES: Two Stick Mobility TriSlider Discs and two high-density Foam Balance Discs. DUAL-SIDED: Smooth plastic on one side to ensure smooth sliding across multiple surfaces and foam on the other side to train your balance. ENGAGE YOUR CORE: TriSlider Discs challenge your core and, use on your feet or with your hands. Target different areas of your core. HOME GYM: The ideal addition to your home gym. TriSlider Discs can be used with existing gym equipment and works perfectly with the Stick Mobility Training Sticks. SIZE: Each TriSlider Disc is 8.5 inches in diameter. The TriSlider is a multi-purpose slide and balance trainer all in one and has been designed to be used with the Stick Mobility Training Stick or as a stand-alone training tool so you can get more out of your workouts. The TriSlider has 3 main configurations: 1. Slider with Balance Disc, 2. Slider without Balance Disc, 3. Balance Disc with Slider.