Watersport Ski Rope: StraightLine 10 section perfect pass Mainline Ski Rope Straight Line ropes have long been the standard for the waterski community, in fact, more records have been pulled on a Straight Line rope than all other ropes combined. SL ropes utilize what is called an S and Z counter twisting method to give the rope better balance and strength. This SL specific construction process creates an equilibrium of both weight and performance. SL ropes are pre-stretched and tolerance checked under AWSA specs before they leave the factory. Comes from a smoke free home