Easy to use, nontoxic tungsten putty. 30% heavier than lead and legal to use where lead is not. Leaves no sticky residue on hands, clothing or gear. Simply pinch off the appropriate amount and roll it onto your leader. Easily adjusted. Can be removed and reused.
I like this stuff over split shot because I feel like when I crush a split shot on my line it weakens my line. This putty rolls easily over the first knot and holds well, and when I'm done I take it off and put it back in the jar.
I was disappointed. I tried this Tung Fu out in New Zealand on a recent trip. I couldn't get it to stick to my leader. I put it at a knot and cooled it in the river, but it would not stay on well at all -- not as well as the product I used to use. It was pleasant to work with, not sticky or messy. If there is some way of making it stay on better, it would be great.
It worked very well. Easy to adjust weight quickly. The only problem I experienced was that it moved a little bit on the tippet. After moving the weight above the tippet knot, I didn't have a problem. I will definitely continue to use this over split shot.