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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!
Good quality rosin in handy, tough case which stops it getting damaged when dropped. Rosin is able to spin around inside the box. Give it a slight turn every time you apply it to the bow and it wears down evenly. Fantastic idea!