This 4 piece necklace set features a different astronomical body for piece on each necklace. The fine details are engraved, then we hand cut each piece so they all fit together like a puzzle. Four 20" thin chains will be sent with this order. However, if you would like different sizes offered below please message us immediately after ordering. We offer various chain sizes from: 18" thin 20" thin 24" thin 20" thick 24" thick Key Chain Adj Black Cord