Reduce Stress,killing bad habbits or killing time.Great hand spinners fidget toy for spinners, Anxiety, Focusing, ADHD, Autism, Quitting Bad Habits, Staying Awake,Ideal for people trying to quite nail biting, smoking, leg shaking and all type of attention disorder issues Ergonomic curved shape design for hand comfort and long term usage. Material: pure copper gear + aluminum body,body’s material is Aviation aluminum, sandblasting effect, feels good. Simply flick and spin for hours with one or two hands Each parts Could dismounting and spin.All Parts Removeable.No Repair, Oil, Maintenance needed!