Beads are US grade 14k gold-filled and wire cuff is 14k gold filled. The thin gold wire is 16g and the thick gold wire is 14g. It is not very distinguishable in appearance, but the thicker style just feels "sturdier" and holds its form better, while the thinner version is more malleable, but still holds its shape! I wanted to make them in both wire sizes to provide an option for every budget!