Twist the spring, the motorcycle can run up to 7~10 feets and you can see the engine pistons move, for a completely entertaining experience! Specifications Assembled Size: 270*116*160 mm (10.63*4.57*6.30 inches) Pack Size: 317*233*39 mm Wood Pieces: 420 pcs Weight: 630g Estimated Time: 4-5 Hours Recommended Age: 14+ Warning: Small Parts Not for Children...

REAL PEUDULUM: A gravity-swing pendulum with precise anchor escapement 3 HOURS TICKING: It can actually work for arounf 1-3 hours when finished! STYLISH OUTLOOK: Appealing home decor for room or office CHALLENGE YOUR MIND: Fun of kits building & brain teasing of mechanical engineering PERFECT GIFT: Gift for mechanical lovers or family & friends...

Difficulty level: ★★★☆☆ Packaging Size: 310*230*35mm (12.2*9.05*1.37 inches) Assembled Size: 330*240*325mm (13*9.44*12.79 inches) Wood pieces: 314pcs Lens: 20mm eyepiece ; 30mm objective lens Weight: 570g