The Duelund CAST CU capacitor is one of the highest quality capacitors available.
(see for example http://www.humblehomemadehifi.com/Cap.html).
The construction builds on the Duelund Virtual Stack Foil design. In addition the
proprietary WPIO dielectricum is used which necessitates several days of impregnation under high pressure.
This results in incredible damping properties, which offers a very high mechanical stability.