Titanium post with stainless steel plate to attach to the earring front. Hypoallergenic. Titanium ASTM F67 Grade 1 Post. 420 Stainless Steel Pad. Titanium is softer than other mystery metal posts (if the post bends just bend it back - it is very sturdy just not as hard as mystery metal). Comes with a pure titanium earnut, and a rubber earnut.