RDB 5 45 strings for bass guitar. Strength 45-65-85-105-125. The strings of the "Extra Life" set are made for the long life they really meet. The strings are covered with a colored layer, which is developed especially for this use. The coating keeps the metal sound constant and protects the strings from afterwards, which causes the strings to corrode and detract from the sound quality and durability. Another fad of this brand is the color differentiation of strings in individual sets.