Super strong, no stretch steel wire loop with black Nylon cover. 2 brass nuts for easy adjustment. ONLY SUITABLE FOR PLASTIC AND METAL TAILPIECES WITH HOLLOW UNDERSIDES.
Grade 8+
Great product but should be longer.
Pros: Extremely stable - my Cello never went out of tune after fitting. Improved the sound quality - allows the notes to ring out. Quite easy to fit except that the screw thread diameter was a slightly too large for my Wittner Alloy tailpiece so it required some force to get it through the holes.
Cons: Far too short - needs to be at least 4cm longer.
Other: The String Zone are fantastic.
Keen Amateur
Best tailgut ever
Pros: I love these carbon fibre tailpiece guts they are so much better than the usual thick nylon ones. They increase the the volume noticeably when used with my Pernambuco tailpieces. Despite Stringzone saying they can't be used with wooden tailpieces, they can be used on wooden ones, if you don't mind taking a small chisel to the area where they're fitted.
Cons: Not really any downside to these.
Beginner
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"