DR Handmade Strings PB5-45 Pure Blues 5-String Bass Strings - Medium (45-125)PURE BLUES bass strings combine a fat, warm punch with an edge especially designed for the modern bass player. By combining a new and unique Quantum Nickel with the highest possible standard in winding techniques, PURE BLUES bass strings achieve an unsurpassed sound and feel. Hand wound on round cores for increased flexibility. DR strings are handmade (not machine made) because our expert string makers are capable of making micro adjustments needed