But really it’s not much more than a glorified top. You wrap a string around the spinning axis and give it a good strong pull, and the thing will spin for you for minutes on end.
You can balance it on your finger or a piece of string, and that gyro just keeps spinning and spinning.
Until the string breaks, or you drop it and one of the spot-welds holding it together pops, then the center of gravity shifts and it loses its stability. Once that happens it’s trashed.
But if yours holds together, you can make it spin and do tricks for years.
Some, you don’t even need string to get spinning.