The Grasshopper is 95% metal, either stainless steel or Titanium. Every single part is custom, the springs, shoes, battery, screens, button, circuit boards, software....and so one. The other 5% is the heater, the circuit boards, and the plastic in the button.
Hate to disappoint but the heater is the secret on how we can take room temp air and make it 210c in just a few millimeters, in real time as you draw on the device.