Mine is 7/16 stayset, about 52' long. I have a fiddle block with a becket and cam on the traveller, and standard fiddle block on the boom bail (both Schaefer 5-series - I guess that would be a 4:1 purchase??). Sailing downwind with the boom right up to the shrouds, all 52' of the sheet are consumed with about a 3' tail coming from the cam. The 7/16" line is PLENTY of thickness for my boat. I considered 1/2" line when replacing it, but decided that was overkill, and that the bulkiness of the heavier line would have been more of a nuisance when the boom was sheeted in. My bail is on the boom end and have a split cockpit config with traveller just forward of pedestal.