The Fischertechnik Profi Pneumatic 3 is a comprehensive STEM construction set designed to teach the principles of air pressure and mechanical power. With 440 durable plastic components, you can explore how valves and pistons operate by building an excavator and several other realistic models that demonstrate pneumatic force in action. This modular system includes a compressor, four double-acting pneumatic cylinders, and four 4/3 valves, all powered via a 9V battery holder. To help you get started, the set comes with a step-by-step instruction manual and an activity brochure, making it a practical tool for students and hobbyists aged 9 and up who want to understand the physics of pneumatics through hands-on assembly.