also it cannot just be any old plastic in a manner of speaking the hardness of the liner counts for a lot [vickers] sic,s are diamond polished so the line glides threw plus the mono heats up when going through the guides certain guides disapitate the heat away better than others espesically on big game rods were fish are likely to give powerful runs and the heat generated is at it,s greatest and could possibly snap costing you a fish of a life time and then thier is the tourney lads when casting that extra yard can be a mile stone