Purchase 20mm nylon core dockline from Southern Rope here.
 
This double braid rope is the best quality Australian made rope you can find. Made from a highly elastic nylon core with a hard wearing polyester jacket, this rope combines the best qualities of both fibers to give you the best quality mooring line money can buy.
 
Made in Australia
Stunning black color fast, hard wearing cover 
Excellent shock absorbing and elongation properties
Low friction prevents creaking and ringing sounds when under tension. Much quieter at night
UV resistant polyester cover extends rope life
Remains soft and supple over the long term
High strength
Easy to handle, coil and splice