Current location - Health Preservation Learning Network - Fitness coach - It looks like copper in a circle. What's that sound when you're swinging inside?
It looks like copper in a circle. What's that sound when you're swinging inside?
Fitness ball played by the elderly

The materials of fitness balls are wood, iron, stainless steel, stone, cloisonne and so on.

Preferred stainless steel fitness ball, 304 pure solid stainless steel, no rust, maintenance-free, sanitary.