Elna RFS (SILMIC II) Series Miniature High Grade Capacitors for Audio uses silk fibers for foil separation instead of paper. By using silk fibers, the RFS (SILMIC II) Series Capacitors offer high grade sound for audio design. Due to the silk fiber's pliability, the capacitor exhibits a superior acoustic sound. The RFS (SILMIC II) Series Miniature High Grade Capacitors can be used to relieve the music's harmonic vibration, increase the purity of the sound at high frequency, decrease muddy sound at middle frequency, and increase high energy bass sound at low frequency.