Super strong, no stretch carbon loop. 2 brass nuts for easy adjustment. ONLY SUITABLE FOR PLASTIC AND METAL TAILPIECES WITH HOLLOW UNDERSIDES.
The best tailgut I've ever used
Pros: This, without a doubt, beats all the hard nylon tailguts. Very easy to fit and stays in place better than the nylon ones and unlike the steel braided wire ones, it won't eventually rust through (yes they do rust if water gains ingress to them as I discovered when one of them gave way on my upright bass whilst at a small folk festival in the middle of nowhere)
Cons: so far I've not discovered any "Don't Likes"