The package contains two body kits for this mechanical toy (Free):https://www.cgtrader.com/free-3d-print-models/games-toys/toys/pneumatic-remote-controlled-toy-car

For the assembly, extra parts needed:

• 623ZZ bearing (4x10mm, 3mm hole) (may poorly work without)
• Piece of 1.75mm filament
• Rubber band
• Thin plastic bag
• 6mm silicon pipe (can be found in any aquarium shop)
• 4mm pipe from intravenous dropper (or any that you could pull onto the syringe end)
• Two 2ml syringes
• 8mm piece of 4mm PTFE tube (optional)
• Air balloon
• Bolts: M3x6 x8, M3x8 x8, M3x10 x3, M3x12 x5, M3x14, M3x25, M3x50
• M3 washers x10
• M3 nuts x30