Feature: 1. WIDE APPLICATIONS: People bought it for kid's science project, physics or mechanics learning, demonstration on class, etc. 2. METICULOUS DESIGN: It's a well designed and crafted mechanical toy, great to display basic principle of external combustion engines. 3. PERFECT GIFT: It is an amazing gift for anyone interested in science . Many people bought our machines as gift to families, teachers, friends, boyfriends. 4. CLASSICAL: With elegant design and fine workmanship, this is a beautiful piece of art. Many people are satisfied with the fit and finish of our engine. 5. SAFE FOR KIDS: Made of high quality materials, exquisite and beautiful, the modle is the perfect combination of texture and beauty. Specification: Item Type: Engine Model Material: Aluminum Color: Blue Product Size: Approx. 13x9cm / 5.1x3.5in Weight: Approx. 255g / 9oz Application: It's a well designed and crafted mechanical toy, great to display basic principle of external combustion engines, . Package List: 1 x Engine Model1 x Instruction Manual Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.