Hot Wheels - Steam Balance ShiftThe Hot Wheels STEAM Balance Shift Playset helps kids understand the science of equilibrium through fun, competitive play as they use the slam launcher to send their cars up and over a seesaw to secure the trophy. Force and speed are the keys to victory, but the real winner will gain a better understanding of balance and gravity while having fun. The set comes with one Hot Wheels vehicle, but it includes two launchers for side by side challenges