These teeth are made out of a zirconium material which is the strongest material available in dentistry.
It also has a nice glassy feel to it so it will feel more like your natural teeth.
Performance
Advantages
As durable as it gets
Minimal wear of teeth
Slim profile
Fixed (not removable by patient)
No Palatal coverage
Stronger biting force
Extremely Stable (will not move at all)
Disadvantages
If done on both upper and lower jaws, there is a clicking noise when the teeth touch each other. Not too loud, but you will notice it. It sounds like glass on glass.