Gears Linkage Design.High quality Metal body (Brass gears + Aluminum Alloy Frame) and Premium Bearing for the Ultimate Fidget Spinner.^ Easy to carry, small, simple, discrete and fun, also effective for focus and deep thought. Mechanical Fidget Spinner. It spins incredibly well, considering the inertia from all the gearing.^ How to use: Hold spinner with one hand and spin/stop with other. Increases Focus and Attention for Children and Adults with ADHD, ADD OCD, and Autism.^ Great Toy For Fidgeters. Perfect for waiting in lines, meditation, timing, quitting bad habits, striking up conversations, and more.^ Its impressively smooth, sturdy, well-made and captivating. It will come in a zippered case to protect. Very solid and well machined. Fun to disassemble and spins forever ^