Customs officers have made a series of seizures of the precursor drug ContacNT, the latest haul stashed inside a stone dragon imported from China.

The two-kilogram discovery last Thursday followed a 5.5-kilogram find in the handles of skipping ropes from Hong Kong earlier that day.

On Wednesday authorities also found 4.6 kilos of ContacNT in the handles of make-up brushes in an air cargo consignment from Singapore.

Customs and Border Protection National Manager Cargo Operations Jagtej Singh says officers are committed to stopping ContacNT being smuggled into the country.

"We use intelligence and a range of detection tools to inspect high-risk consignments," he said in a statement on Monday.

"Regardless of the concealment method, we have the tools, technology and resources to detect and seize illegal goods."

ContacNT is a cold and flu medication containing high levels of pseudoephedrine, which is used to make methamphetamine and other types of amphetamines.

Anyone caught importing it illegally could face a fine of up to $170,000 and/or five years in jail.