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Because Panerai automatic tourbillon uses ceramic ball bearing, ceramic wear resistance, this kind of bearing does not need lubricating oil to intervene, so it spins louder than ordinary steel ball or pin bearing.
First of all, the cost of these bearings is more expensive than normal ball bearings.
Secondly, ceramic bearings do not increase damping due to oil degradation.
There's a sound when it's slapped, and that's because, similar to a balance wheel, the spring set of mechanisms is an up-and-down shock absorber, jewel clamped, and works like a top.