Grinding Beads for Better Grinding and Better Performance. Zirconium beads go by many names around the world: Mahlperlen in Germany. Bolas de Moliendas in South America. Pearls in Europe. Zirconia beads in Asia. But whichever corner of the globe you call home, whatever you call the beads, one thing is clear— FOX Zirconium Silicate Grinding Media...