A Massachusetts postal worker allegedly used the mail to traffic the powerful synthetic marijuana K2 from China to the US for five years with the help of another man, Manhattan federal prosecutors said.

Josephine McLaughlin, 65, and Daniel Borer, 42, were arrested Thursday.

They’re accused of importing K2 and making and distributing “massive wholesale quantities” of a smokeable version of the drug, according to an indictment.

The drugs were “branded with colorful graphics and distinctive names, including ‘Dead Man Walking,’ ‘Klimax,’ ‘Zero Gravity,’ ‘Twilite,’ ‘Psycho’ and ‘Get Real,’ ” court documents claimed.

McLaughlin and Borer face up to 60 years in prison.