Brand: ROKRPuzzle Type: 3D Puzzle, Mechanical ModelColor: Natural WoodTheme: Ancient Siege Weapon, Historical ModelMaterial: Selected Linden WoodNumber of Pieces: 142Assembly Time: 2 hoursAssembly Difficulty: Medium (3/5)Manufacturer's Recommended Age: 14+Product Dimensions: 8.3 inches x 7.3 inches x 7.5 inches (21 x 18.5 x 19 cm)Product Weight: 1.19 lbs (539 g)[Fully Functional Ballista Mechanism] This ballista model is based on an ancient siege weapon and features a fully functional mechanism. This fully functional ballista is equipped with movable wheels and adjustable firing direction via precision gears. Experience the realistic operation of a ballista, just like historical war equipment.[Precision Laser-Cut Parts] Utilizing laser cutting technology, parts have tolerances of less than 1/5000 inch. All 142 parts are precision-cut from select basswood, ensuring a perfect fit and easy assembly without glue.[Interactive Gear System] The interlocking gear system enables realistic aiming and adjustment. Watch the mechanical components work in perfect harmony, experiencing ancient engineering principles firsthand.[Complete Assembly Experience]Includes detailed illustrated instructions and approximately 2 hours of assembly fun. A perfect choice for model enthusiasts seeking to combine historical interest with mechanical engineering.[Beautiful Display Item] The finished ballista serves as a beautiful display item for your desktop, bookshelf, or collection. Spare parts are included to ensure complete assembly, making it an ideal gift for history buffs and model makers.Wood