This is a custom built c420 jib cunningham. Based on the concept used by LISOT coach Steve Keen. This jib cunningham uses FSE Roblines Ocean 3000 Dyneema. The slick setup allows for a range of jib tack settings using a 4:1 purchase and an easily accesable finger trap splice adjuster. The line is custom spliced to be able to fit onto any club 420 in minutes with no knots required.