Excellent design. Each lever weighs 64g. Their is a nice elastic band that keeps them secured together. Function very well (just changed the tube on my wife's bike). There is something reassuring about the cold heft of a metal lever that is lacking in the plastic designs. It is kind of like a drinking glass made of real glass rather than polycarbonate: somehow, it just feels better.
I have run this tube in my rear tire for about 6 months without incident. How durable is it? Let's just say that I am a 240lb guy who likes to jump curbs, logs, and the occasional roadkill. No incident to date.
Nice little kit. Weighs 28g and contains all of the necessary components. The scuffer works well and the patches stick pretty well (better than some other patches from well established companies). The case certainly has a wow factor despite its simple design. The plug is a little hard to get out at time. Plus, the contents take some tapping to get dislodged. Otherwise, great little kit.