About ENGINE MAX Design Inspiration: Inspired by the engine structures of the Boeing 787 and J-20 fighter jet. The front turbine shape replicates the rotor form of an aero engine, while the rear fan-style lock corresponds to engine blade architecture, delivering a powerful mechanical industrial aesthetic. Material Upgrade: This is a material-revised iteration of the original Engine model. Crafted entirely from crystalline titanium, it offers a substantial, solid grip. Titanium alloy balances high strength and refined tactile feedback for fidget play. Customizable Play: Fitted with an R188+6703 linkage structure. It accepts 4–12 pieces of 6mm steel beads for flexible tuning, unlocking a wide range of distinct tuning-fork resonance effects.