Rockin' Rosin Cat Rockin' Rosin is a medium-amber student rosin made into a fun cat shape and wrapped in a cat themed fabric. Rockin' Rosin has been especially popular with parents and teachers who are always looking for a practical gift or incentive for their students. Make learning music fun. Students rosin their bowsfor a change! Rockin' Rosin was Product of the Month in The Strad's February 2013 issue and is a featured product in the June 2013 issue of Strings Magazine. For violin, viola, cello, and bass.