Concentric Pendant is part of the 2D3D series of transformable jewelry. Comes as a flat disc of metal that you bend to create a three dimensional shape. Comes packaged with instructions; Black and Red pendants come with an 18" black cable, 18K Gold Plated pendant comes with an 18" black cable with gold clasp, & Stainless Pendant comes with an 18" stainless cable. You have everything you need to make a wearable sculpture. 3” diameter.