Victoria Police have arrested 10 Malaysian nationals over the suspected trafficking of commercial quantities of heroin.
Homes in Box Hill, Springvale, Braybrook and Dingley Village were raided early on Tuesday morning.
A large amount of heroin, cash, an Audi, a Lexus and designer handbags, watches and jewellery were seized from the properties.
Eight men and two women were arrested and will be interviewed.
Police will allege those arrested were involved in a Malaysian drug trafficking syndicate.
The investigation is ongoing.
