The Best Way To Spin Super lightweight unbreakable advance polymeric-polyolefin engineering material. Perfectly balance spinner, no weight offset to cause vibration. Straight radial-high chrome steel bearing. Takes just a few minutes to install. Optional anti-theft spinner locks available. Optional performance kit to enhance the spinning time. IZOD Impact Strength 60 kg-cm/cm Heat Distortion Temperature 75oC (167 oF) Temperature Resistance: -40oC ~ 75oC