It's billet, it comes in all your favorite PRP 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 favorite engine models! These oil filler caps suit the vehicle make in the drop down 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.