It's the Small Cup
This adapter allows you to connect devices that use a 2.5mm audio plug to your lightning devices. Although its not the real balanced output, it's a very convenient way to most of the users.

Metallic feeling just as it is
Not polished nor galvanised, every single unit comes with its own cutting lines.

Surgical grade Stainless steel
It adopts the same material as that of the iPhone11 Pro, the austenitic 316 stainless, a so-called surgical grade stainless steel.