The Danvise is made from a couple of materials. The jaws are hardened steel, the stem is aluminum. There are two stainless steel ball bearing assemblies and string steel washers that manage the rotary tension. The remaining parts are made from Delrin, an engineering thermoplastic used in precision parts requiring high stiffness, low friction and excellent dimensional stability.
Typical applications for injection-molded Delrin include high performance engineering components such as small gear wheels, ball bearings, ski bindings, fasteners, knife handles, lock systems, and model rocket launch buttons. The material is widely used in the automotive and consumer electronics industry. The M-16 rifle's stock and other parts are made of it.
The Danvise is a tough vise, it's very light and holds hooks better than most vises costing much more. Contact me if you have any questions regarding the Danvise, I would be happy to share all the info I have. You can see more here https://www.leroyflytying.com/store/index.php?main_page=advanced_search_result&search_in_description=1&zenid=3hi3uq7elgbigflcb12oqme6q2&keyword=danvise