... stretch tubing and two weighted toning balls. Gym ball , or exercise ball , fitness ball , swiss ball;Made of PVC or eco ... -friendly PVC;With stretch tubings and weighted toning balls;Ideal for stability training and toning arm muscles;Size: 55,65,75cm ... etc.Optional accessories: Double action pupm, puller, plug, ruler. Burst Resistance Gym Ball , Exercise Ball , Fitness Ball , Swiss Ball