Melos Rosin is tested to perform in all conditions. The “Light” type is used more I high temperatures (spring, summer), for smooth playing or for a solo in chamber music. The “Dark” type of rosin is used more in low temperatures (autumn and winter), for full tone playing, in an orchestra or for solo concerts. Once can choose to mix based on your own personal bowing style and technique. Kit contains one (1) mini Melos Cello Light Rosin and one (1) Melos Cello Dark Rosin packaged separately. Total weight 30g (2x15g)