Masterline Pro 10 Loop Mainline The Masterline Pro 10 Loop Mainline is a competition water ski mainline built from 80-strand Poly-Pro rope in a 10-section configuration. Marked shortenings run at 15', 22', 28', 32', 35', 38', 39.5', 41', and 43' off, covering the line lengths a competitive course skier actually runs from longline through to advanced tournament shortenings. The 80-strand construction holds section accuracy through repeated course passes, and the marked shortenings give clean visual confirmation of line length from the boat. The Pro 10 Loop sits as the bridge between the recreational 8 Loop and the full tournament-grade slide-loop ropes. Choose the Pro 10 Loop Mainline if you ski the slalom course at club or competition level and want full shortening range without paying for tournament-grade slide-loop construction. Available Lengths: 10-section mainline with shortenings 15' off through 43' off