Stainless steel silent bearing, super silent, detachable, rotates for 2-4 minutes. The bearing allows it to rotate smoothly and quietly for a long time and provides enough feedback to meet the needs. If the bearing makes noise when you first receive it, just remove it, rinse it with lukewarm water for a few seconds, then blow it a few times, dry it, and put it back in place. It should be perfect rotation. Triangular balance principle, super stable rotation without shaking, intelligent structure, excellent quality, is a good choice for professional players. It is not completely solid and the metal part in the middle is fixed by friction. If it is very unstable, you can uninstall and clean the widget, which will actually be very quiet again. This compact violin rotator measures 1.8 inches in diameter. It is very suitable for skilled hands. It does not swell in your pocket.