Nickel Plated Steel Bass Strings wound on Round Cores. Sunbeams are another step forward on a continuing path for players who constantly seek to upgrade their skills and tools to achieve musical satisfaction. Sunbeams are the next generation of nickel bass strings as they are wound upon round cores. Sunbeams are a step forward for the traditional player and the advanced exponent of fretless bass, both of whom want brightness and warmth. Sunbeams feature the easily recognizable feel and flexibility of DR round core construction, with nickel warmth, softness of feel and increased response to magnetic pickups due to the sensitive magnetic content (compared to steel) of the nickel plated wrap wire. Tony Franklin says "Sunbeams amaze me...I love them on my fretless." A long time favorite of U2's Adam Clayton.