Alert: Zhu Zhu Toys May Contain Unsafe Levels of Antimony

The Consumer Product Safety Commission has opened an investigation into the popular Zhu Zhu Pet toy because it may contain higher-than-allowed levels of antimony, a heavy metal which if ingested can make children sick.
On prolonged exposure, antimony — which is used in textiles and plastics to prevent them from catching fire — can cause lung and heart problems, ulcers and diarrhea.

Source: NBC News