Unlike continuous line Code zero & Gennaker furlers, these "structural systems" are fitted permanently on the sailing boat. It is an "in and out" furling system to handle Genoa, Solent, Staysail, or even ORC. The structural system components are: a swivel fixed on the mast, a continuous line drum fixed on the chain plate, and an anti-twist cable linking both mechanisms. This cable transfers efficiently the rotation from the drum to the swivel and is captive from the sail tape. The sail is latched at the tack and halyard points. The main advantage of this system is the saving in weight, higher than a carbon headsail furling system fitted with a fibre forestay.