Materials and Composition
As Baoding balls became more popular and metalworking skills improved, construction methods varied. Most Baoding balls made and used today are constructed as a pair of hollow spheres, one inside the other, with a chime between which rings as the inner ball strikes it. Many modern examples are decorated with cloisonné and brass wire; however, these are not as suitable for actual use because they can easily chip when dropped or when they come into contact with each other. For injury recovery, hollow balls are generally more suitable due to their lighter weight. For exercise purposes balls made of solid iron, steel or tungsten carbide provide added weight, requiring more effort to rotate.
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