Q: What are these made from and how thick is the steel?

They use A36 steel, the same weldable grade trusted across heavy-duty off-road builds, so a shop can repair them if a hard hit ever bends something. The rocker panels are just over 1/8 inch thick (gauge 10), a deliberate balance of strength and weight. We don’t go thicker here because the sliders anchor to the chassis at multiple points down their length, so piling on steel like the 1/4-inch used in our front bumper would only add dead weight and cost range.