There are more than one hundred flat mirrors and more than two hundred curved surfaces (the price in Beijing).
Sapphire mirror is characterized by ultra-high hardness, which is second only to diamond, but it is as fragile as glass and afraid of impact.
The watch mirror of high imitation Rolex is also sapphire, and the real Rolex is also sapphire. In fact, the most advanced watches are usually sapphire, and they are afraid of sudden impact.