The 725 series features elegant, yellow-golden color carbon trebles and basses wound with Goldin wire. The Super-Carbon trebles provide a significantly softer and warmer tone compared to traditional carbon strings.

The winding wire of the bass strings is crafted from the gold-colored metal alloy "Goldin", which is completely free of nickel and cadmium, ensuring a clear and brilliant sound. This set is highly regarded by numerous professional guitarists as one of the top string choices for classical guitar.