They have different thickness options at the bottom of the page:

http://www.blackpantherskidplates.com/blackpanther_armor_033.htm

But I don't see any pricing difference, so... Wonder what the price is for the good quality ones (3/16") plates? I wouldn't put a 10 Ga. skid plate on my truck; it would crumple up pretty quickly with how I use skid plates...