Pirastro Goldflex Rosin features tiny flecks of gold inside the rosin! The addition of gold flecks allows for an extra smooth grip. This is an ideal rosin for students and professionals alike. It gives a warm and bright tone and is ideal for all types of strings. Goldflex Rosin comes in a round cake inside a protective satin-like cloth. This popular rosin is produced by Pirastro the biggest seller of strings in the world. They have been developing and producing rosins in Offenbach Germany for over 200 years. Goldflex Rosin is well suited for violin viola and cello.