Stonfo Bobtec2 Predator Fly Tying Bobbin Holder- This bobbin holder has a larger tube than the Bobtec1 and is used for larger threads and flies. Stainless steel bobbin has a slider control for adjusting the tension on the thread. It also allows for a quick change of thread spools. Perfectly balanced when rotating, it is an ideal bobbin for creating split thread dubbing loops. The tube has a very strong hardened steel bushing to prevent fraying.