Harmony ball is a lovely piece of jewelry. It is essentially a chime pendant, so when you move, it emits a soft audible chime that soothes the wearer. Inside the ball, it works like a tiny metal xylophone, with a little metal ball that bounces around to create the soothing chimes. Each chime ball has its own, individual sound as each one is made by hand. The larger the harmony ball, the louder the sound. Harmony ball is also known as Mexican Bola, Druid Bell, and Angel Caller. Style: Plain (LS71) Size of pendant: 20mm (diameter ), 925 hallmarked inside the bail. Material: 925 Sterling Silver Origin: Bali, Indonesia Chain Necklace Style: Satellite Chain Length: 24 inch long Material: 925 sterling silver Clasp: 5mm spring clasp Marking: 925 Gift Box Included.