REPLACEMENT SCREW-ON EXTERNALLY THREADED OPALS A stunning simulated Opal replacement screw ball. This Opal is amazingly more radiant and colorful than a natural Opal. Perfect for mixing and matching, and changing the look of your gold body jewelry. This replacement ball will only fit our line of 14kt gold straight barbells, curved barbells, twisters, and circulars. Brand: FreshTrends Age: Adult Condition: New