This dragon yin yang necklace is made of solid hypoallergenic stainless steel. Yin and Yang is a concept of dualism, describing how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent in the natural world, and how they may give rise to each other as they interrelate to one another. The trinity knot pendant approximately measures (without bail) 20mm in diameter x 1.4mm thick. The bail can accommodate a chain or cord necklace up to 3mm wide. The draco opposite balance amulet has a high polish gold color PVD finish with black enamel and will arrive ready to wear on a 20-inch gold stainless steel cable chain necklace.