Engine is a precision-engineered fidget spinner conceived by Nine Hands and meticulously designed by Master Duankong. Drawing inspiration from the engines of the Boeing 787 and J-20 fighter jet, its front turbine design mirrors aircraft rotors, while the rear fan-inspired locking structure echoes propeller blades, blending aeronautical engineering with everyday carry art. The Engine Fidget Spinner is not just a spinner — it’s a fusion of aviation-inspired design, precision engineering, and EDC artistry. A must-have for collectors and enthusiasts seeking both aesthetic appeal and mechanical excellence. A Legendary Series Known among enthusiasts as the “King of Tuning Forks”, the Engine series debuted with the original Large Engine in May 2022. Current circulation is extremely limited, with fewer than 199 units available on the market. Materials including steel, titanium, and zirconium have been officially retired, making this series highly collectible. As a flagship in Duankong’s EDC fidget spinner lineup, the Engine remains a timeless classic for collectors and players alike. Precision Mechanics & Customization Dual-bearing structure: R188 + 6703 for smooth and stable rotation. Compatible with 4–12 beads (6mm), producing sounds reminiscent of aircraft roar and tuning fork resonance. Supports glow-in-the-dark beads or DIY tritium tubes for a futuristic visual effect. Design & Experience Large size accentuates the linked motion effect, providing both visual and auditory pleasure. Rotating without tritium: minimalist elegance. Adding DIY tritium tubes: Mach ring tech aesthetic emerges. Interaction between beads and hollow body enhances the kinetic and acoustic experience, making each spin captivating. Specifications Brand:Devil King – Duankong & Nine HandsMaterial: Crystal TitaniumAvailable Colors: Gold, Cyan, Blue, PurpleWeight: 141 g