Masterline Progressor Deluxe MainlineMasterline Progressor Deluxe Mainline The Masterline Progressor Deluxe Mainline is a slalom water ski rope designed by the world's best ski coaches to help skiers learn the shortline. It runs from 18. 25m down to 10. 75m, with additional braided in loops at 18. 5', 25', 30', and 33. 5' off line lengths that aren't standard tournament shortenings but make the gap between recreational and tournament loops easier to bridge. The mainline is hand braided