The fully assembled version includes:
The keyboard PCB, the case, and the aluminum plate.
Keycaps (included Mac & Windows keycaps).
Adjustable-actuation-point Gateron double-rail magnetic switches.
The K8 HE is compatible exclusively with the Gateron Double-Rail Magnetic Switch. It does not support other magnetic switches, such as the Gateron Magnetic Jade or Gateron KS-20 Magnetic switches.