It cost $45 and is simply a plastic noose, magnet and 1.5 lb ball (I didn't want to pay $300+ for the high-quality model). I'm wearing it right now and while it is visibly stretching me, I don't feel the stretch as much as I would with my traction device. In fact I barely feel it at all. Should I keep it on for an extended period (1-2 hours maybe?) or should I add more weight to it?