Joaquin R. Montano-Martinez, 28, of Mexico, (left) and Patricio Rosales-Diaz, 43, of Palatine.

A Mexican national and a Palatine man are being held on a $1 million bond after police found two kilograms of fentanyl, worth $200,000, during a traffic stop in Cary.

Patricio Rosales-Diaz, 43, of Palatine, and Joaquin R. Montano-Martinez, 28, of Mexico, were both charged with manufacturing or delivering fentanyl over 900 grams, a Class X felony, and possession of more than 900 grams of heroin, a Class 1 felony.

McHenry County Assistant State’s Attorney Brian Miller said law enforcement stopped a truck being driven by Rosales-Diaz.

The truck was traveling westbound on Route 14 through Cary.

Montano-Martinez, who is a permanent Mexican resident, was a passenger in the truck.

The McHenry County Sheriff’s Office located approximately two kilograms, or 4.4 pounds, of fentanyl in the truck.

The wholesale price for a kilogram of fentanyl is approximately $25,000, Miller said.

Fentanyl, when broken down, sells for approximately $100 per gram in McHenry County, Miller said.

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Bulk fentanyl is typically mixed with other substances to increase profits.

“Assuming the fentanyl was broken down and sold in its current form, its approximately street value would be $200,000,” Miller said in court documents.

Miller said the seized fentanyl could produce 20,000 doses if broken down and sold in its current form.

McHenry County Judge Jennifer Johnson set bond for Rosales-Diaz and Montano-Martinez at $1 million.

They would each need to post $100,000 cash in order to be released from the McHenry County Jail.

Prosecutors have filed motions asking the court to verify the legitimacy of any funds posted toward the two men’s bond.

A bond review hearing is scheduled for March 1.