But that is nothing new and has been around for centuries. It is a very common middle east technique. Classical and GRAN guitarist Anatoliy Olshanskiy is very well know for these nail hooks and has been selling them for 10 years. I think the idea comes from India. The hooks are fashioned to look like nail jewelery.
Brass works great.
You need to soak your nails in water until soft, install the nail hooks and leave them on while you practice or throughout the day.