THE SOFTEST RUBBER BALLS YOU WILL EVER USE! Constructed using new Aerosoft Floating Rubber Technology, these A+ Series balls are designed to hold up to heavy use and are the softest rubber balls you will ever use! The secret is the injection of millions of microscopic air cells into the rubber cover during the molding process. These air cells create a thick resilient cover that is almost twice as thick as the cover of an average rubber ball. The extra thick cover is a benefit for those participants that have a hard time getting a grip on traditional rubber balls. In addition to the Aerosoft cover, we have added an 80% Butyl bladder to increase air retention which eliminates the need to blow balls up before every use. SIZE: 8 1/2" dia.