15 foot mainline has a "shuttle" that rides over the outside , once weight is applied to the shuttle it locks in place like a whoopie sling
Also known as a UCR (Utility Constrictor Rope)
Min. length 36 inches, maximum length 15 feet
The main line has loops one both ends so it can also be used as a stand alone 12 foot extension
Can be used as an extension or an adjustable main suspension line
The spliced loops work like a soft shackle with EVO loops and universal loops (see last picture and video at 1:10 in)
1 ounces weight
1600# tensile 7/64 dyneema construction
Auction is for one line
Real world tested and handmade in Bend Oregon USA
For set up with soft shackle see this listing ...
https://www.ebay.com/itm/285522149069