Firstly don't be fooled - as with several Kuryaken products these spinners are 50% plastic - specifically the blades themselves. I was sooo disappointed when opened the package and find tthat and I know at somepoint a rock is going to break something. Secondly there's no bearings, just some rubber bushings. So the spinning stops even before you do. No slow roation at stop signs/traffic lights here. It also takes some speed to get them going - more than the 25mph that is claimed. But they're appropriately priced and do look good either stationary or spinning. All in all, I would have paid double for bearings and actual chrome. 3/5 stars.