Masterline Optimiser Jump LineMasterline Optimiser Jump Line The Masterline Optimiser Jump Line is a core rope tournament water ski jump mainline a rope inside a rope built from PolyProMAX yarn. The dual rope construction is smaller in diameter and more aerodynamic than a single line jump mainline, so the rope cuts through the air with less drag through the cut and approach. PolyProMAX is selected for its snap back behaviour under load the same yarn family Masterline uses across