Fast Cast - Flat Mono Running Line. Fast Cast baby! The Fast Cast mono running line shoots through the guides without friction and it comes out of the water with the least resistance, making it popular running line for wide rivers and long casts. Its density is close to the water’s so you can achieve deeper depths than with floating running lines. It has very low stretch giving you the ultimate feel on your fishing and it has very low memory. Thanks to its thin diameter it doesn’t take as much room from your reel as the traditional running lines. Available in 35lb and 50lb, 60 metres per spool.