North Korea continued its lucrative tungsten trade with China amid growing prices for the metal in April, NK Pro analysis of Beijing’s customs data showed, as its imports of fabrics and hair products pushed bilateral exchanges beyond an eight-year high last month.

China’s General Administration of Customs (GAC) released a breakdown of traded items between China and North Korea on Wednesday, showing trade between the neighbors hit nearly $326 million last month for the first time since late 2017.

North Korea supplied China with $27.2 million worth of tungsten ore in April, following $32.5 million in shipments