A fabulous piece, easy to wear and perfectly unisex!  One side is filled with  carbon fibre that has come from the dashboard of the Ford GT race car and the other has a piece of a ballbearing cage from the gear box in the Aston Martin Valkyrie.  These have been set in resin.  The band is a twisted, stainless wire.  Perfectly flexible to fit wrist sizes.  A great gift for any motorsport or car lover.