Edele retaining disc. The 3cm thick foam fully met its purpose. Holes are hardly visible in missed shots. Very easy assembly. Despite two small criticisms, full marks. The noble-looking dark red velvet, stained while dusting with a damp cloth, unfortunately a bit off and fit a Winmau board. Unfortunately, not all board manufacturers have the same outer diameter. For the Winmau board cutout is not quite Press, the small gap to the Board, however, is to get over.