The U.S. Consumer Product Safety Commission bans toys intended for children under 3 if they contain small parts or easily break into pieces that are small parts.
These Dragster cars from Z Wind Ups contain small parts like a rubber traction band on the wheels, and have a choking hazard safety label "too small to read," according to PIRG. The label can be seen in the next image.
Credit: U.S. Public Interest Research Group