Check the listing for details. Magic Rosin Ultra Formula Rosin Bach Manuscript. Color: Bach Manuscript, Condition: New. Listed at 16.00 USD. This superior quality, professional-grade rosin provides excellent grip and delivers clear, complex tone. Choose between 3G or Ultra formula. 3G is a grippy rosin designed for violin and viola and Ultra is a grippier rosin that we recommend for cellists, bassists, or any advanced string player seeking more grip and "pop". This special recipe uses only premium, purified pine resins and yields rosin with a clear, glass-like appearance that allows each design (placed underneath the rosin cake) to really POP. Choose your formula: 3G or Ultra 3G is a grippy rosin designed for violin & viola (our sku L42533)Ultra is grippier than 3G; it's recommended it for cellists, bassists, or any advanced string player seeking more grip & “pop” Less is more.