These are really something else.  They are made from steel swarf (shavings) from making the new Aston Martin Valkyrie race car components that will make its debut on global circuits next year.  What makes these so interesting is that the steel has to heat approximately 500 F in order for it to turn the colour blue and its a fine line between blue and black.  These have been set in silver Titanium and resin.  Top seller as they speak for themselves.