The Fully Assembled version includes:

The keyboard PCB, the case, and the aluminum plate. Keycaps. Adjustable-actuation-point Gateron double-rail magnetic switches. 

The P1 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. Please drop your email on "Notify Me When Available" if the product model is out of stock. ISO options: UK, German, Swiss, and Nordic layouts. No discount codes can be used for P1 HE versions.