While the Wireworld Eclipse Silver cables feature the patented Octo DNA Helix design with OCC-7N silver-clad copper conductors, the addition of this silver-cladding on the ‘basic’ Eclipse 8 improves on the ‘sound definition and resolution; thereby making them sound closer to the solid silver Gold Eclipse 8.I am skeptical of any company that touts silver clad copper. Well-designed cables imho ought to be all copper or all silver. Silver clad copper causes problems. I don’t recall the specific engineering explanation but my take was that the very thin coating of silver only causes problems and no benefits. Pairing dissimilar metals seems to always cause problems in any application whether it be mechanical or electrical.
Note that the entire Cardas line-up is all copper. I have had great results using Analysis Plus' all silver Silver Apex for interconnects.