Baoding balls
Baoding balls (Chinese: 保定健身球; pinyin: Bǎodìng Jiànshēn Qiú; Wade–Giles: Pao3-ting4 Chien4-sheng1 Ch'iu2) are metal balls small enough to hold in one hand, used for physical exercise and therapy. They are also known as Chinese exercise balls, Chinese health balls, Chinese meditation balls, and Chinese medicine balls.