Gradient Fitness Core Sliders, 1 Pair of Ergonomic Pear-shaped Gliding Discs, Dual Sided Sliding Plate for Carpets or Hardwoods, Includes Free Storage Bag and Exercise Program Use it for core strengthening, athletic conditioning, Physical Therapy, injury prevention, yoga, dance, balance, and proprioception. The innovative pear-shaped design optimizes ergonomics by increasing the natural contact position of your hands and feet Dual sided disc for versatility. Fabric side for hard floors - Smooth side for carpets Take it on the go with the included storage bag and exercise program 90 day 100% money back guarantee