rolling ball size:2.5m diameter material:0.8mm transparent PVC blower:one CE blower inflatable ball,still called rolling ball ,zorb ball,walking ball.We have single layer ball,and double layers ball in our factory;We use best 0.8mm pvc to make zorb ball and rolling ball.Throw in a bucket of water, hop inside the inflated Zorb ball, run, tumble, flip or slide inside it, doesn't sound fun enough ...