Liebenzeller's unique rosin recipe was developed by violin maker Franz Thomastik nearly 90 years ago. Traditionally made by hand and created from pure larch resin with the addition of various metals, Liebenzeller's produces livelier, warmer and brighter sounds than other rosins, with enhanced tonal volume and greater modulation and carrying power. It effortlessly conveys the individual sound of the instrument. The bow develops an even response and minimizes ambient noise. Liebenzeller Gold IV is a soft grade for cello.