These unusual earrings have been printed on a 3d printer using a plant based poylmer called PLA. This particular polymer has wood fibres in it so the printed piece looks and feels like wood.
 
The shape is that of the Adrenaline molecule, a hormone that is released by the adrenal glands and the medula oblongata. Its main job is to regulate visceral functions like respiration. It is also used a medication to treat anaphylaxis, cardiac arrest and bleeding.
 
The earrings come on silver plated ear hooks.