Design & Color: May vary to the stock. Customer may not choose. Material: Metal Feature: Put your own choice of jaded ball to make a sound with these harmony necklace, also called a harmony ball necklace, it's a pendant worn by an expectant mother throughout her pregnancy. The pendant emits a soft chime sound as it bounces against mum to be's growing baby bump. Over time, its chime will become familiar to baby who may find the sound comforting once they are born. Size: 90cm x 3mm,ball 2.2-2.5cm Dia