1. Material is aluminum /Brass/red brass. it has more balance ,it could rotate long time 2.Use the professinal Ceramic Zirconia Bearing .you do not need more any maintain, do not need to add lubricating oil. 3.Wash by water directly .easy way to clear it Great For Anxiety, ADHD, Autism, Quitting Bad Habits, Staying Awake On Long Car Drives, Etc; Perfect fidget toy to keep your hands busy or to just play with. It feels nice in the hands and it is silent so you won't be bothering anybody; How to use it: Hold spinner in one hand and use the other hand to spin it rapidly with small continuous strikes to keep it spinning indefinitely. With practice you can spin it using one hand only with the fingers to start and stop spinning. Packaging & Shipping 1*Fingertip gyro 9*6.2*2 cm Iron box
