This is an interesting  piece indeed.  An original made from the Ford GT, Mazda RT-24 race cars and the Aston Martin Valkyrie  The ballbearings are from the gearboxes of the Ford GT and the Mazda whilst the swarf/spring chain comes from making parts for the Aston Martin Valkyrie.  The ballbearings have been set in resin.  The spring chain attaches with a silver plated lobster clasp and the we've used a two tone silver on the back.  It's a very interesting piece and very comfortable to wear.   Slink come gift boxed with a black, satin ribbon.