Material：All-metal Spinning time：About 1-3 minutes based on the power you give. Ceramic center bearing,SLA technology,laser industrial molding technology. It is portable metal spinning device designed to keep your hands busy and focus your mind. Great for people with Fidgety hands, ADHD, Anxiety, OCD suffers, fun & calming. It can be spun in your fingers, desk, ground. Use one hand to hold the spinner and other hands spinning it, then it will keep spinning from 1-3mins based on the power you give, and it can rotate to different direction when you roate your hands because of the gravitational potential energy.