For a quick release system with a large loop at one end to hook over the end of the boom, and spliced loop at the other for use with older 'hard' attached blocks.  Made from 3mm SK78 Dyneema available in a range of colours.  Choose the configuration that you want (middle of boom) or the longer front of boom version; colour and rig  type. Nominal length 115cm (or 167cm for 4.7) for the middle boom and 265cm (or 317cm for 4.7) for the longer front of boom version.  

Options are available for the addition of blocks and double puller toggle.