This educational construction set helps students learn the principles behind pneumatics and uses realistic models to demonstrate how compressors, pneumatic valves and cylinders work. The new, powerful and compact compressor guarantees a reliable supply of compressed air to the models. In addition to vehicles such as front loaders, hay bale pickers and tree trunk grips, other educational models provide students with hands-on knowledge on the subject of pneumatics in combination with the instructional teaching and activity guide with is also included. Contains 440 components (including a compressor, four pneumatic cylinders, four 4/3-way manual valves, and a battery holder for 9V block batteries) for building 8 different models. Double Sliding Doors, Scissor Lift, Catapult, Balloon Pump, Tree Trunk Gripper, Hay Bale Picker, Front Loader, Excavator. Requires a regular 9V battery (not included), or if you prefer, all models can also be powered with either the fischertechnik Power Set or Accu Set (each sold separately). Comes packed in sturdy plastic Gratnell's storage box. Recommended: 1 set per 2 students.