"pp502’s combined arm- and backrest, also called a top rail, is made from solid wood. The different pieces have been cut from newly felled trees that must be at least 150 years old in order to be the right size. The wood is left to dry for up to 2 years, in a highly controlled environment until the humidity is down to no more than six percent. The frame is made from silver soldered stainless steel and includes an adjustment mechanism enabling the user to adjust the height of the chair. Only the finest leather is used for upholstering the seat."