Hang on, it’s going to be a bumpy ride! With hundreds of small raised bumps around the entire ball, therapeutic activities are even more stimulating. Perfect for awakening sensory system and for sensory seekers. Use to strengthen core muscles, body awareness, balance and attention. Try rolling it on your child for a deep pressure tactile massage. Inflates with air pump (sold separately). Holds up to 200 lbs. 28” Diameter. Blue. Use with adult supervision. Age 3+