This unique bass string set is specifically constructed of a nylon core with silver plated windings. These round wound strings provide a warm booming sound that the U-Bass is known for. They feature lower tension compared to traditional built bass strings, making them easy on the fingers with a great overall feel. Features:Nylon core with Silver-plated windingsspecifically constructed for use with the Kala U-Bassprovides player with extreme playabilitywarm, powerful sound with clear note articulationstring construction and gauging gives player very accurate intonationgauges .050, .065, .095, .110, .125 made in USA.