It's billet, it comes in all your favourite Platinum Racing Products colours and it will set off any engine bay. What more could you want?! We can’t just make our products look like anything else, it has to have a certain PRP flair I think we have achieved that. We're very happy to release this one of a kind Billet Oil Cap to suit all your favourite engine models! These oil filler caps suit the SR20 and our 12an universal cap suits most aftermarket cam covers including Hypertune, PRP and any other covers that utilise a 12AN ORB filler cap provision.