The Kellogg Company issued a voluntary recall on Monday of its Kellogg’s Frosted Mini Wheats cereal after metal fragments were found inside the packages.

The products recalled include some of the Frosted Mini-Wheats Bite Size Original and Mini-Wheats Unfrosted Bite Size cereal products “due to the possible presence of fragments of flexible metal mesh from a faulty manufacturing part,” according to the U.S. Food and Drug Administration.

"We understand and apologize for your concern," Kellogg’s said in a statement. "According to David Acheson, an internal medicine physician and former Chief Medical Officer at the FDA Center for Food Safety and Applied Nutrition with whom we consulted, the likelihood of these fragments making their way into the food is low; furthermore, the chances that any affected food will cause injury is low."

The Wall Street Journal reported that Kellogg expects to record a charge of between $20 million and $30 million in the third quarter related to the recall.

The cereals with the letters KB, AP or FK before or after the Best If Used Before dates between April 1 and Sept. 21 are included in the recall. A full list of the products affected are listed below, courtesy of the FDA.

Although the FDA initially issued the recall on Monday, according to CBS News, many customers are upset they didn't hear about the recall until Thursday. CBS pointed to one YouTube user, mdillard13, who filmed a video of himself using a magnet on a plate of the recalled cereal.

Another commenter on the Kellogg’s website wrote, “Your site and is very confusing and it really pisses me off it is not user friendly at all when you are trying to get a hold of your company. I have three boxes of mini wheats, it has KBB yes two B’s after the expiry date of 2013 aug 14 so I would assume they are okay am I right.”

Kellogg’s said concerned consumers can call 800-962-1413 Monday through Friday from 8 a.m. to 6 p.m. Eastern Time.

Kellogg’s Mini-Wheats Recall

The recalled Frosted Mini-Wheats Bite-Size Original and Mini-Wheats Unfrosted Bite Size cereals have the letters KB, AP or FK before or after the "Best If Used Before" date on the package. Products included in the recall are listed below:

Kellogg's Frosted Mini-Wheats Bite Size Original cereal

• UPC 3800031829 - 18-ounce carton with Better if Used Before Dates between APR 01 2013 KB - SEP 21 2013 KB

• UPC 3800073444 - 18-ounce carton with Better if Used Before Dates between APR 01 2013 KB - SEP 21 2013 KB

• UPC 3800031834 - 24-ounce carton with Better if Used Before Dates between APR 01 2013 KB - SEP 21 2013 KB

• UPC 3800046954 - 30-ounce carton with Better if Used Before Dates between APR 01 2013 KB - SEP 21 2013 KB

• UPC 3800031921 - 70-ounce club store carton with Better if Used Before Dates APR 01 2013 KB - JUL 29 2013 KB

• UPC 3800004961 - single-serve bowl with Better if Used Before Dates between 04013 KB - 09213 KB

• UPC 3800021993 - single-serve carton with Better if Used Before Dates between AP 04013 - AP 09213 or FK 04013 - FK 09213

Kellogg's Mini-Wheats Unfrosted Bite Size cereal

• UPC 3800021983 - single serve carton with Better if Used Before Dates between FK 04013 - FK 09213

• UPC 3800035982 -18-ounce carton with Better if Used Before Dates between APR 01 2013 KB - SEP 21 2013 KB