Taken up a new hobby racing model cars, so my brother and I picked up these two on Tuesday evening. There both race runner v4 competition 1/5 scale Zenoah engined cars, mixing 35ml of 2 stroke oil to 1 litre of super unleaded. The green one is a 29cc bore-out and my yellow one is a standard 26cc and they are both very quick. Definiately not kids toys but i will be giving my sons a little go of it some day!! LOOOOO