This kit includes everything you need to convert your jib sheeting to a 2:1 purchase system.  The 2:1 system allows for the jib to be fine tuned.  It also makes trimming in heavier wind easier.  The kit includes the 2:1 purchase bridle with Ronstan Series 30 BB OrbitBlock blocks, two 21′ jib sheets cut from 1/4″ trophy braid, and a small line to run underneath the jib track or through the jib car if you do not have the Harken carbo block with the hollow center to dead end the jib sheet to.