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HREW ( Hot Rolled Electric Welded ) Steel tubing that is in most cases plenty strong enough for most offroad use. DOM (Drawn Over Mandrel) Which is a higher strength steel commonly used in roll cages.
We are always working on uploading our Installation instructions to the website, we also have been uploading a lot of installation videos on our YouTube channel as well. If you cannot find what you are looking for in those two places, please reach out to us via email and we will make sure to help get you taken care of.