This is a simple and high tech looking piece made from a black coated, stainless steel bangle, a carbon and porcelain bearing and a steel washer.  A great unisex piece that would suit anyone and can be worn anywhere.  There is a small level of flexability in the bangle if you wanted to bend it carefully to increase or decrease the size for maximum comfort and fit.  The bangle fit will depend on where you choose to wear it and the size of your wrist/arm.
Measurements are:
Widest measurement is 6.5 cm for wrist width without adjusting bangle width
Height is also 6.5 cm
Width at the top of the bangle is 2.5 cm
Width of the bangle itself is 8mm