TRAX™ Surface Prevents Slipping and Provides Neurosensory Stimulation NEW Burst-Resistant Design Provides Safe Balance Platform for Conditioning and Rehabilitation Exercises. Fun Dog Fitness! Builds Confidence Improves Fitness Focus Attention Strengthens Muscles Special TRAX™ Design Provides Superior Grip and Stability Features TRAX™ Neuro Stimulation Bumps Burst Resistant to 300 lbs. – Designed to Deflate Slowly If Punctured Inflation Pump Included The new Trax Donut was engineered to be a bit smaller than the previous donut to increase the challenge and improve results while maintaining the same functionality. *product can slightly vary in size and color The FitPAWS® TRAX™ Donut Ball is uniquely-shaped inflatable fitness ball designed specifically for dogs. Its flattened base offers more stability than other inflatables. With your assistance, your dog can learn to stand, sit, lay, side step and perform other beneficial exercises.