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This is a jet ski / personal watercraft course that is used by both amateur and professional riders. As well as being easy to set up and maintain, the SP-J4 is unaffected by changing water levels, does not require diving to set up, and has been declared legal for use in IJSBA sanctioned events. How Does The SP-J4 Work? It consists of a stainless steel mainline cable which connects all of the cross arms and components together. The cable, along with 100 lbs. of tension, aligns the course perfectly. The entire structure of the course is suspended underwater by buoys. Construction: The mainline cable is a military spec stainless steel cable with a PVC coating. It's easy to handle, resists kinks, and will not lose dimensional accuracy. The cable is made in sections, allowing for easy replacement. High Impact Plastic Reel: The SP-J4 comes on a high impact plastic reel complete with outside crank and carrying handle. Due to its small size, it can be transported easily. Telescopic Arms: Four-section telescoping PVC arms use quick release hardware to facilitate rapid extension and retraction. All stainless steel mainline cable hardware needed to install the course and attach the buoys (buoys not included -Click here for slalom buoys (MS5331) is included, along with detailed instructions on installing and removing the course.