This is a tool that I purchased a while back…. now I have five of them The thread tension settings are awesome and you can use even the lightest of threads and with confidence know they wont break! The Italian design is incredible. It even fits between your two tying fingers perfectly, making it ergonomic. This product get two thumbs up. The tip is made of such hard stainless steel that there is literally no way that it will fray your tying thread. Its also extremely reasonably priced at under 30 bones. It makes fly tying so much easier.
Here is a youtube link to watch the Stonfo Bobbin in action