Select the prop "Mag 1". This is another one of the 3 props that make up any "magnet" (magnets compose of the zone, the base, and the magnet itself). I don't want to get TOO heavily into magnet generics, but the base is useful as a "zero point" or "base" for the magnet to operate on. Anything your magnet does is relative to the position of that magnets base (remember this if you do any scaling or rotation in particular).