The ball is in 24k pure gold. It is hollow. Ball (球) represents one gets what one wishes for, 有求必应. There is also a Chinese character 福 (Fortune) carved on the ball.
The green beads are natural nephrite (碧玉) of 10mm. They have good lustre. The price includes the nephrite bracelet.
We do have ball in smaller sizes which can be put in between two pixiu in a bracelet as shown above.