316L Surgical Steel Ball Circular Barbell also know as a Horseshoe.
 
Available in 1.2mm or 1.6mm gauge with 6 - 14mm internal diameter.

The spikes can be unscrewed at both ends to allow for fitting or to change.

Circular Barbell jewellery is very versatile and can be worn in many piercings such as septum piercing, ears, lips, daith, and tragus.