Easy To Carry,Small, Simple, Discrete and Fun, also effective for Focus and Deep Thought.Help ADD & ADHD sufferers Relieve Stress and Anxiety, Perfect Size suitable for autism adults and children over 10 years old.Si3N4 Bearings For Incredibly Long Frictionless Spins.Perfect Toy For Fidgeters. Flick And Spin For Hours With Just One Or Both HandsOil, Maintenance needed! Use it right out of box.