DESC: Thomastik : 4-String Bass Strings | Buy your JF344 E-Bass Jazz (43-100) 4-String Set at Samash.com. We offer financing options! E-Bass Jazz Series are strings with extended durability and high output. A highly flexible steel core gives the string a balanced feeling and a special character. The overall sound characteristics can be described as very close to the double bass. Nobody knows flatwound bass strings better than Thomastik-Infeld Spirocore strings by Thomastik-Infeld have been legendary a