Check the listing for details. DR Sunbeam Medium Bass Guitar Strings .045-.105. Condition: New. Listed at 24.99 USD. DR Sunbeam Medium Bass Guitar Strings .045-.105 Nickel Plated Bass Strings wound on a 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-plated bass strings as they are wound on round cores. Sunbeams are a step forward for the traditional player and the advanced exponent of fretless bass player, 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 stainless steel) of the nickel plated wrap wire.