The case is also new, made of 100% ceramic – the Lightweight is ceramicized aluminum and carbon, and the Range Rover is ceramicized aluminum only. In terms of performance, it is the El Primero 400B movement that powers the new Skeleton, the very same caliber Zenith used for the previous two skeleton references. It’s an automatic high-beat (5 Hz) column-wheel chronograph, with a 50-hour power reserve, and it can be seen in full through the sapphire at the back of the watch.