Star Wars Legion: STAP Riders Unit Exp. - Rules of Play says:
Within the STAP Riders Unit Expansion, you’ll find two beautifully detailed, unpainted STAP rider miniatures that featuring a number of customization options. Two different flight stands let you depict them at different heights, while the STAP pilots themselves can be assembled in a variety of poses. Finally, four upgrade cards invite you to equip them with comms systems to more fully integrate your STAP riders into your army.