Autoban(Korea) AD89 Negative Ion Power Handle Car Steering Wheel Suicide Spinner Knob Black It release negative ion 872/cc and vio-infrared rays 90.1%, which decrease bacterial air pollutions in the car, and also magetic balls help well circullarationod blood while driving The metal ball bearing installed inside makes the steering soft and keep the knob durable Easy to install and fits most standard wheels Stylish and elegant design upgrades the fashion of the car