The glasses are unique in terms of the materials used and the production techniques implemented. Almost all machinery needs to be built or retrofitted specifically. In the early stages, moped brakes, old actuators and other items were used provisionally because they lacked the money to outfit machines for prodution. In order to be able to bend the first parts into shape, the first pieces of wood was pressed from a living room table with the mechanical milker from a neigboor, who had retired from farming. The press is still in use. Even the stone frames had their start this way. Nowadays, precise machines are used until the point where the frames are passed on to highly sensitive additional processing that is done by hand.