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For selecting the degree of hardness, note the following: The Liebenzeller Metal Rosin is produced in the hardness I (hard) – VI (soft)
Basically: for solo playing the harder of the two specified hardness is preferred!
Before the first application of Liebenzeller Metal Rosin we recommend:
Clean your bow with a soft cloth and apply initially to little rosin! Likewise, if you apply another rosin varieties - so the difference is apparent.