Two men charged with shipping methamphetamine in the mail to several counties including Elk will serve lengthy prison sentences, Attorney General Josh Shapiro announced Wednesday.

According to a press release from Shapiro’s office, Larry Dean and Daniel Hopkins were “two ringleaders who ran an interstate crystal methamphetamine ring that shipped and sold $1.6 million in drugs in Jefferson, Clarion, Clearfield, Elk and Forest counties.”

Hopkins will serve 95 to 190 years in state prison, while Dean will serve 55 to 143 years in prison, Shapiro reported.

The pair was found guilty by a jury on March 24 of charges including delivery and possession with the intent to deliver drugs-corrupt organizations.

The investigation, dubbed “Operation Snail Mail,” led to charges being filed against 30 people in September for allegations they shipped crystal meth to North Central Pennsylvania counties from drug dealers in Arizona and California.

“The 35 pounds of crystal meth they sold produced between 32,000 and 64,000 doses of the dangerous, addictive illegal drug,” the press release stated.

Two other “ringleaders,” Joseph Kot Sr. and Dale Hanlin, also received prison sentences. Hanlin was sentenced Wednesday to eight to 17 years, and Kot was sentenced previously to nine to 20 years.

Nine others involved in the ring were sentenced Wednesday, too.

“Crystal meth trafficking is a growing problem in Pennsylvania, particularly in rural parts of our state,” said Shapiro. “When drug dealers from other states targeted rural Pennsylvania, our agents and prosecutors stopped them and shut this operation down.”

Shapiro attributed the work of Jefferson County District Attorney Jeffrey Burkett’s office, the U.S. Postal Inspection Service and the Pennsylvania State Police for helping in the investigation.

The cases were prosecuted by Senior Deputy Attorney General Marnie Sheehan-Balchon and Jefferson County District Attorney Jeffrey Burkett.