Dock-lines with RLR  (Rapid Length Recognition).

RLR is a simple innovation for recognising the length of dock-lines. when retrieving a required length line from  storage.

A boat requires dock-lines of varying lengths, such as short lines for bow and stern, and longer spring lines.
and when lines in storage  are the same colour, it is very difficult to judge the various lengths.

 The simple colour coordinated tags, makes length recognition very easy.

We use nylon for dock-lines because the natural elasticity of nylon reduces shock loading when the docked boat is subjected to wind buffeting.