C. Sherman Johnson Splice Line Large Boat Kit f/Boats up to 40ft. Sherman Johnson Marine's Splice Line fittings allow you to easily splice hi tech Dyneema line to standard life line fittings. The Splice Line fittings are designed to be light weight and easy on the line. Both US Sailing and ISAF now allow Dyneema/ Spectra life lines for offshore racing and Dyneema/ Spectra is also a great product for the cruising sailor that wants to replace their stainless steel life line cables. Professional splicing recommended.These kits include everything needed to install upper Dyneema life lines without gates. For double life lines buy 2 kits. For adding a gate use the C. Sherman Johnson Gate Kits. Package Contents: C. Sherman Johnson Splice Line Boat Kit C. Sherman Johnson SLK-40: Splice Line Large Boat Kit f/Boats up to 40ft