18K Yellow Gold
The pin is made out of gold.
The attachment has two variants of external thread: 0.8mm bzw.1.2mm. As an attachment, it fits accordingly for Internal jewelry (Barbell / Labret / DA) with an internal thread of 0.8mm or 1.2mm.
For 0.8mm thread - 1.2mm Barbell / Labret / DA
The pin is made out of white gold.