PVC materialNo noise， no smell， environment friendlyStrong stainless Steel rod with comfortable grip， durable useTotal body exerciser.Compact and portable， use it anywhere， anytimeWheel diameter size (approx.) 14.5cm / 5.7''Net Weight: 0.8kgMaximum Load: 550kgHow to use:Just push slowly and hold your position， before returning to the start position. The forwards and backwards movement works your abs in both directions.