Got an email from Rufus today. He said they are Velvet-Animas gut wrapped with a metal that looks like copper.
Sorry, but what you've done for 30 years simply has nothing to with what Velvet puts in Anima strings. Your quote from Rufus' email does not correspond to the Anima product in the market for the last 5 years.
My information is Velvet used gut at one time but no longer. Nuno Alexandre at Velvet's customer service wrote to me that Animas do NOT contain gut, and if you don't believe me you can write him at [email protected]
Point of fact is Rufus told me in Vienna his strings were made of "silk". Gut was not mentioned I am just reporting that fact. Maybe he no longer has Animas on his bass or is not sure what Velvet now uses to make them.