There are many watches which actually replicates the Royal Oakís design. However, the unique feature of Audemars Piguet Royal Oak is that it has hexagonal screws in its bezel and these screws are distinctly polished. The bezel of the Royal Oak has eight such screws. The stainless steel case of this watch measures 44 mm. The case is also made of pink gold or forged carbon. The bezel and the pushers are made of ceramic.