High quality washers to protect plastics on the playfield.
The panes are made of impact and shatterproof polycarbonate (Makrolon)
and are highly transparent.
Due to the thin material thickness of 1mm, these are perfect for use.
Thicker material means that the nuts can no longer be screwed
on completely and can then be loosened.
The discs are not lasered and therefore have no melted edges.