Q: What is this arm made of and how is it validated?

It is CNC-milled from 6061 aluminum for maximum strength while saving weight, and it is optimized with FEA simulation to ensure strong static, dynamic, and fatigue performance. The design was stress-modeled before production, so the strength is engineered rather than assumed from how it looks. Unplugged Performance developed its Model S suspension program on the Dark Helmet race car, so parts like this come from real racing and street testing before public release.