The SKLZ Balance Disc is designed to help you improve balance and intensify workouts. It allows for strengthening and toning of large core muscles as well as smaller muscle groups. The ergonomic design encourages proper posture while standing, kneeling, or sitting through low-impact strength training. Easily inflate or deflate to match your ability or challenge your balance.Features:*Inflatable and lightweight for use anywhere*Dual-texture, slip-resistant surface provides grip and massaging comfort*14 inches wide and 2.25 inches thick*300 lb weight capacity