Welcome to the forum & congrats on the mech. Stealthvape are a good vendor & you'll get a decent product from them.
It's copper & a mean little mod, known as a hard hitting mod & i'd recommend some quality batteries like the sony vtc5 or the efest purple 30amp. Don't buy cheap batteries.
Because it's copper too, don't over tighten anything, don't hulk it. Once the battery is in it & it's all tightened up it will hold well with just a slight tighten. It might be a good idea to carefully take it apart when you get it & get familiar with it. If you have any doubts about what you're doing just ask. Oh, & if you take the switch apart, look out for the very small locating pin in there, don't go losing it. Good luck.