metal bearing for my tt-01 chassis from yeah racing with 10 dollars! when i bought my car kit i didnt known that the plastic bearings will block my car and after a week i bought this metal bearing and realise a great diference to my car. it slides smoothly with almost zero friction and my motor runs easier. Before assamle your car be certain to buy this also so u dont have to brake it down after a week or so to replace the plastic ones with those. great product in excellent price and great fast and reliable shipping from rcmart team. thank you rcmart.