Houston Hardened: Custom Sand Cast Magnesium Tattoo Machines, Built to Last. We're bringing old-world craftsmanship to the modern tattoo artist. Each machine is sand-cast and hand-poured using the strongest, lightest magnesium alloy, right here in our Houston workshop. Choose your frame – Harp, Walker, Cutback Open Face, or Commando – and get a machine built for durability and performance. Support local craftsmanship and experience the difference of a truly exceptional tool.