Good information has already been provided above but a couple of tips: Don't buy 'oversized' line above that in the manual, as, if you get an untidy furl, it may jam more easily; if you furl in heavy winds the sail gets much tighter on the forestay and needs extra line to completely furl it in so take account of that extra requirement when choosing length and make sure you can reach a winch with the loose end as you may need to use it one day. The reel encased in the furler has a captive bracket (stops line from coming off when fully out) and this is suited for line with the core still intact so I wouldn't strip it out.