Powertrain Yoga Stability Disc is inflatable and made of anti-burst PVC. It can be used anywhere and any time you want to intensify your workouts, whether it's yoga, Pilates, or ab exercises. Using this cushion helps strengthen your deep core muscles as the body constantly adjusts to maintain its balance. It can also be used as a lumbar support cushion. Reap the core strengthening and posture benefits by sitting on it or keeping it behind your back as you work throughout the day. You can also choose between the two textured sides, which prevent the disc from slipping while also giving you the sensation of a massage. The stability disc is lightweight and travel-friendly, so you can bring it with you to the office, park, or gym. A free hand pump is included with each disc for easy inflation and deflation. Colour: Black, Size: 34.5 cm.