the backs are also titanium-

Internally threaded

see link below to purchase one

delivers everyday comfort with a luxury finish

Titanium Push Fit Threadless Flatback Helix Piercing double layer the backs are also titanium-Premium Implant Grade Titanium Made from ASTM F 136 titanium, safe, hypoallergenic, and nickel free. Push Fit Threadless Design Easy to insert and remove while ensuring a secure, comfortable fit. Flatback Style Sits flush against the skin for maximum comfort, even during sleep. Multiple Gauge Options Available in 20g, 18g, 16g, and 14g to suit your piercing needs. Versatile Use Perfect for helix, cartilage and other ear piercings. Sold Individually