Falk Culinair copper cookware manufactured in Brussels, in Wespelaar, Belgium.
Copper is the best conductor of heat, it heats faster needing less heat than stainless or aluminum, it also reacts to changes in heat faster than other metal.
The high-end clad cookware (aluminum sandwiched in stainless), conducts heat okay, and the stainless is non-reactive with food and easy to care for, although it's expensive by comparison, it's considerably less than copper.
As copper also reacts with food, for every application other than sugar work, jam and egg whites it must be lined, tin and to a lessor degree silver have been the lining of choice.
With EPA regulations, it's getting harder all the time finding a place in the states to have copper cookware re-tinned.
I had older copper pans, it became to expensive with shipping and tinning fees to maintain, a couple hang on the wall, most have been gifted for decoration.
There's better information on the Copper Pans web site.