The earrings/creoles are made of stainless steel and are black with a movable ball. 
Advantages of stainless steel: Scratch-resistant / does not tarnish. 
 
 Product information:
 
Material: 316L stainless steel
Color: Black
Width: approx. 3 mm
Outside diameter: approx. 1.6 cm
Closure: flap closure
Box contents: 1 pair/2 pieces