Polycrystalline Diamond (PCD) Drawing Die Since the 1970s, scientists and engineers all over the world have been researching and utilizing a highly advanced material called polycrystalline diamond (PCD). PCD is produced through a process of sintering that
Because of the tiny size, 3D fan can be portable carried. The whole size is 30mm diameter. And it can be assembled as customized shapes. It is a magic of hologram fan models.