*Compact portable size, easy to use, you can spin it in one hand rapidly when it gain a impetus from your other hand. With practice, advanced users can hold, spin and stop the spinner using only one hand. A great toy for killing time, helping relieve stress, Anxiety and Boredom, etc. *Not 3D Printing. Made of Nylon kind of Soft and Environmental Material, Stronger than ABS plastic for Longer Service Life, and Not Easy to Break when falling off.