Ah, I see... misunderstood your query. (I think it was you actually, that turned me onto the Jazz Rounds)
Nothing firsthand, since I've stuck with them ever since, but here's what their description claims, in case someone else does.
Description
Thomastik-Infeld has developed this unique sounding string constructed with a similar design to it's Jazz Flat Wound counterpart but with the round wound sound. T-I Jazz Round Wound outer wrap is a small diameter Nickel Alloy winding which adds more bite to their upright style tone without the typical round wound excessive string squeak and premature fret wear. Thomastik-Infeld has designed these Jazz Round Wound strings with lower tension and gauging to increase ease of playability and to reduce strain on the instruments neck without sacrificing the strings output.
Construction:
Small Diameter Nickel Alloy Round Wound
Round Steel Core
EDIT- there's a couple posts in this TalkBass thread comparing them to various DR sets...
https://www.talkbass.com/threads/thomastik-infeld-jazz-rounds.622601/page-3