<p>S2 (9 years old) wants a set. A classmate brought his set in to school as his “favorite sound.” Much of the appeal for S2 was the silk brocade box, which felt nice to him. The balls come in pairs and are made of different materials. S2 liked the “wind-chime-like” sound the other boy’s balls made. I gathered that they are meant to be rotated around in the palm by moving fingers, thereby improving flexibility and dexterity and reducing stress. </p>
<p>Anyone have any advice on which material (metal, stone, etc.) would be best, and what would be a good online source? I want to order some for S2 for Christmas.</p>
<p>I would expect a 9-year-old boy to want the metal ones. I would suggest buying inexpensive ones, because they will most likely just sit around forever after a short period of mild interest.</p>
<p>I received a pair of metal balls from my boss when he traveled to Singapore. I’ve seen it somewhere for less than $20. I must admit I don’t use these balls that much.</p>