Make sure this fits by entering your model number. TRY IT, YOU'LL LOVE IT! RitFit Balance Trainer is here to boost your regular workout routine in ways that you can't even imagine. Whether a casual exerciser, runner, dancer, martial artist, or any type of athlete, using our Balance Ball Trainer will work wonders for you! Ideal for rehab, after surgery work, and elders fall prevention training. Superior Material & Perfect Size: Constructed of durable rubber and sturdy, ABS plastic which is anti-slip.The trainer dome side up provides an ever-changing, unstable, dynamic surface while the device itself remains stable. Environmental-friendly PVC material brings non-toxic, chemical-free using experiences. And it’s easy to store. Large weight capacity:660lbs.