All moving parts panels are pre-assembled in the UK. The choice of materials used to manufacture each of the panels will vary from design to design, however the quality of the materials will always remain very high. All exposed fasteners are made from stainless steel, as are all rods, tubes and ball bearings. All clear window and mirror inserts are manufactured from polycarbonate, which is virtually unbreakable and will keep the cogs, bearings and small parts safely away from the children. All small parts including discs, counters, frames and bolt covers are made from HDPE, the same as the main panel.