The government took aim at sets of small, high-powered magnets. The brand names include Buckyballs, and Magni-cubes.
The Consumer Product Safety Commission wants them off the market.
One child has died and 2,900 have been treated in emergency rooms after swallowing the small magnets.
If several magnets are ingested, they can attract each other, pinching or blocking the intestines or other parts of the digestive tract.
After a recall some companies still refused to stop making them. So now the commission set new standards.
The toys must have a lower magnetic power or be too big to fit inside small areas, such as a cylinder.
If you have the toys at home, it's best to send them back.