Keychron V1 QMK Custom Mechanical Keyboard ISO Layout Collection
The fully assembled version includes:
ABS plastic housing
The keyboard PCB, screw-in stabs, and the steel plate
OSA profile keycaps (including Mac & Windows keycaps)
Keychron K Pro switches
The difference between Fully Assembled Knob (Frosted Black)-ABS Keycaps and Fully Assembled Knob (Frosted Black)-PBT Keycaps is the type of keycaps they use.