Features: The Stirling Engine Model demonstrates thermodynamics principles with near Carnot cycle efficiency, offering a safe, ducational tool for visualizing air expansion/contraction through its PC body and pre assembled ABS wheel designs. Crafted from heat resistant PC materials and featuring a fully structure, this physics demonstration showcases internal mechanics clearly while ABS components ensures long time stability without deformation risks. Ideal for STEM educators, physics students, and science enthusiasts, this Stirling engine model simplifies complex thermal dynamics concepts through hands on experimentation and classroom friendly operations. Perfect for interactive lessons, home science projects, or laboratory demonstrations, simply place the engine on hot water to observe sustaining motion without open flame or hazardous materials. Combining industrial grade construction with educational clarities, this pre assembled Stirling engine model bridges theoretical physics and practical learning through visible pistons movements and instantly operational readiness. Specifications: Component:PCB Size:Approx.12cm/4.72''x10cm/3.94'' Package Includes: 1Piece Engine Motor Model note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.