1)GS01C gym ball base 2)With ears,with valve,inflatable 3)The ball ring can be printed logo on its surface 4) ... Helpful for whole body workout;To stabilize the gym ball,preventing the ball rolling around while taking gym ballexercise for beginner. ... gym ball,preventing the ball rolling around while taking gym ballexercise for beginner Standard: SGS, EN71,RoHS,CPSIA,ASTM : GS01C Gym Ball Base/Gym ball ...