Faceted 4mm black Czechoslovakian glass interspersed with sterling silver from Turkey. The collection of stretchy bracelets layer beautifully and are easy to take on and off (though I leave them on all the time). This bracelet measures about 7" (medium), but can be made larger or smaller. Questions about sizing? Please measure your wrist where you'd like to wear the bracelet or email Julie@CarnelianKnoll.com for help.