A ceramic tube on this bobbin keeps tying thread from rubbing and wearing, like it often does in metal bobbins. It keeps thread from fraying and weakening while you are wrapping it around the hook.
This is the perfect bobbin for any fly tier's hand. It is light weight and not bulky. The length is just right to work around the hook and vise. The ceramic spout allows for a smooth release of thread whether 3/0 or 6/0. The No. 1 bobbin on my desk.
After reading several reviews I purchased this ceramic bobbin and have been very pleased. It works very smoothly, does not damage tread. I have used it on both very large spools of tread and on the very tiny spools that silk tread come on. It works great on all of them.
I tried tying treble hooks without one of these and was very frustrated. Bobbins make holding and wrapping thread a pleasure. You will be amazed if you have never used one. Well worth the money. get a couple if you use different colors thread.