I say mothers because I was going to do this tomorrow and it would be the easiest to get. What product would be the best for the tips? Billet or metal polish? I guess I don't know the difference. Also could these be used on my rims? Yes I'm a dumbass and don't know what they are made of. If it helps it's a 2013 Mercedes slk. I'm guessing they aren't chrome, but I don't even know if I could tell