It concerns headphones JBL Live 400BT and not JBL Tune 510BT though: Stiftung Warentest 13.07.2020 "PAH in the ear pad of the headphones. Nevertheless, Stiftung Warentest does not recommend to buy. Because in the test, very large amounts of the polycyclic aromatic hydrocarbon (PAH) benzo[g,h,i]perylene, for which a mutagenic effect has been proven in animal experiments, were found in the ear pads of this model.... " Good to know...