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.
ABS Keycaps: Backlight shine-through
PBT Keycaps: Non-shine-through
No discount codes can be used for V2. Please drop your email on "Notify Me When Available" if the product model is out of stock.