Passione Bass Strings -
New in 2011-12, Passione Bass combines the smooth, dark sound you want from a Pirastro Orchestra String with much easier playability. This is a 21st Century bass string, made in Germany.
Now available in Medium Tension, Stark (Heavy) Tension, and Solo Tuning.
Extension Sets and 5th Strings round out the selection.
Lemur Music sells them in sets, as well as individual strings.