Melos Rosin Bass - DarkMelos Rosin Bass Dark is specially produced to endure the lower temperatures of autumn and winter. With a harder grip on the strings, and offering strong and full tone sound qualities, this rosin is designed for specifically to deliver medium and low wave frequencies efficiently. Melos Rosin is Made by a Musician for Musicians. 100% handmade to order from high quality Greek pine tree resin, this rosin is natural, fresh, and pure.