Zeus has the capability to fill natural PEEK with a radio-opaque filler, resulting in Radio-opaque (RO) PEEK. RO PEEK is defined by its ability to illuminate during a surgical procedure utilising fluoroscopy. The advantage of PEEK compared to alternative polymer-based materials with this filler is its strength and wear, heat and chemical resisance. Unfilled PEEK positions itself as a high performance alternative to traditional materials including aluminium, steel, glass, and other polymers. The introduction of the RO filler adds to the already available stiffness while maintaining a lighter weight than many metal alternatives.