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Accidentally put this on a violin bow which made the G string on the violin vibrate too much. However, when applied to a cello bow, it gives it that extra friction that really makes the cello strings sing. Even for an 8-year old boy doing grade 2!
The best rosin I have used in a long time although I didn't really know whether to scratch the top but it worked very well. Very good case for protection and very good value for money. Extremely pleased!