The magnets, imported by Pacific Science Supplies Inc. of Bensenville, Ill., come in bar or "U" shapes. Some are diamond-shaped magnets made to attach to a small, yellow cone, which serves as the base.

About 40,000 of the recalled magnets were sold through education-supply distributors between April 200 and February 2008 for about $9 each.

Consumers were advised to stop using the magnets and return them to Pacific Science Supplies Inc. for a free replacement.

Consumers can also call It's Pacific Science Supplies at 800-530-1500 for more information.