What Materials For Pipe?? Help?

I was just wondering what kind of metals are safe for the stem and bowl of a pipe?

I heard copper can kill you because of oxides.. and such,,, and aluminum is also dangerous

I want to make a pipe but i want to be able to use it long term and not kill myself.... how about steel, or brass?

Use an apple! Remember an apple a day keeps the doctors away

umm i need a long term solution...

silver...bump?

bump again,.

nickel, anodized aluminum, or brass

use a plastic bottle with a pen tube make sure no air leaks use a small socket for the bowl takes 5 min to make and its a bubler style