Pack of 3 cards for submitting your work from the Airbrush Nails Course. Card 1: 12 Finished Designs. Clip your 12 finished airbrushed nails on this card. Card 2: 8 Techniques Practice Card. Practice, practice, practice those 8 basic airbrush techniques until they're second nature. Card 3: Gun Control Card. This is the first card you need to understand how the airbrush works.