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. 2-3 swipes on your bow is enough for most players.