They are truly anti-sway bars. They work to prevent the vehicle from swaying, or leaning. A lot of people are just too lazy to type the whole thing out, so they become sway bars. And it's a bar running side-to-side. When the vehicle leans in a corner, one side pushes down on it's arm, the other pulls up. So they are trying to twist the bar longitudinally in opposite directions. The bars resistance to twisting prevents the vehicle from leaning too much. The larger the diameter, the more resistance. Which is what Hellwig anti-sway bars are, considerably larger in diameter than the stock ones. Hotchkiss bars sound like they are stronger, because they are bigger in diameter. But, they're hollow. OOPS!! They're lighter, but not as strong. I have a chart at home, I'll post it tomorrow. Hellwig bars are smaller in diameter, but considerably stronger in their resistance to twisting, than Hotchkiss bars are.