carborite

Surprising lightweight and durability that cannot be imagined from the exterior
Composite carbon, which is lightweight and durable, is used for the body case material. Furthermore, the movement holder, which holds the movement in place, is made of mu-metal, a special alloy with extremely high magnetic permeability, to achieve a magnetic resistance of 80,000 A/m. This makes the watch 50% lighter than conventional Ball watches with high magnetic resistance. The result is a watch that is 50% lighter than previous Ball watches with high magnetic permeability.