The QSP Puffin Carbon Fibre Thumb Stud is a very nicely put together folding knife. Everything about it says quality, from the CPM S35VN, 2 tone satin finish stainless steel blade and the titanium, carbon fibre handle to the ceramic ball bearing pivot system, this is a quality item for the knife aficionado. Each element is combined with the utmost precision. The blade sweeps open smoothly to engage with the framelock with a satisfying clunk and is held in position with rock solid stability.