The Fully Assembled version includes:
The keyboard PCB, the case, and the aluminum plate.
Keycaps (included Mac & Windows keycaps).
Adjustable-actuation-point magnetic switches.
The K10 HE is available in different switch versions.
The Gateron Double-Rail version supports only Gateron Double-Rail Magnetic Switches.
The Keychron Ultra-fast Lime version supports only Keychron Ultra-fast Lime Magnetic Switches.
Other magnetic switches (e.g., Gateron Magnetic Jade or KS-20) are not supported.