The recalled magnetic building cubes contain magnets that can become loose if the cubes break or open, posing a magnet ingestion hazard to children. When high-powered magnets are swallowed, the ingested magnets can attract each other, or other metal objects, and become lodged in the digestive system. This can result in perforations, twisting, and/or blockage of the intestines, blood poisoning and death.
Read the official CPSC recall notice and consumer instructions.