LCX-3B, extra hard tension, is a classical halfset made up of D'Addario's silver plated copper wound on an exclusive multifilament core. The string is then lightly polished for a rich tone and smooth feel. Pro-Arté Composite Core Lightly Polished Silver Plated Copper Bass Half Sets – These Lightly Polished bass half sets feature a polished silver plated copper wound an exclusive multifilament composite stranded core material. Each wound string is polished to a smooth surface for reduced finger noise. Each half set contains 3 bass strings in a convenient resealable pouch.