They are made of 3/16" steel with 1/4" mounts. This is a WELD UP KIT.It comes in pieces and will need fabricated upon receiving. The item "Hardcore Offroad Rear Bumper DIY Weld Up Kit (For Nissan Xterra)" is in sale since Friday, April 5, 2019. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Exterior\Bumpers & Parts". The seller is "hardcoreoffroadllc" and is located in Weedville, Pennsylvania. This item can be shipped to United States.