A lugger is usually a two or three masted vessel, setting lug sails on each mast. A jib or staysail may be set on some luggers. More rarely, lug topsails are used by some luggers – notably the chasse-marée. A lug sail is an asymmetric quadrilateral sail that fastens to a yard (spar) along the head (top edge) of the sail. The yard is held to the mast either by a parrel or by a traveller (consisting of a metal ring that goes round the mast and has an eye for the halyard and a hook which fastens to a strop on the yard). A dipping lug sail is fastened at the tack (front lower corner) some distance in front of the mast. A standing lug's tack is fastened near the foot of the mast. The halyard for a dipping lug is usually made fast to the weather gunwale, thereby allowing the mast to be unstayed. A common arrangement is to have a dipping lug foresail and a standing lug mizzen. This arrangement is found on many traditional British fishing vessels, such as the fifie - but there are examples of dipping lugs on two masts or standing lugs on all of 2 or 3 masts (as in the chasse-marée).