These kidney necklaces fit together perfectly as they are made from the same coin. All of our jewelry is hand cut so it provides you with the best quality possible. These designs make great gifts. Two 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