For those interested, Presto are working on new strings with a metal outer wrap.
From the http://www.presto-strings.com/
Upcoming new products:
Presto Balance for double bass
Our newest developpment, the Presto Balance chromesteel double bass strings, will soon be available. We will offer the Balance strings in two models: Balance Orchestra (optimized for arco playing), and Balance Jazzicato (optimized for pizzicato playing).
I got a prototype set of the Orchestra set, in Medium gauge, and these strings are excellent for pizz playing!
The E was somewhat dull but it has been reworked and a new one will be sent to me.
The finish is of outstanding quality; extra smooth and highly polished.
More to come later, but keep an eye on these strings!
P.S. I'm not affiliated in any way to the company.