Exceptional quality best describes XMark's rubber hex dumbbells. The one-piece high quality cast iron heads have been press fitted and welded to each handle. A tough, premium rubber casing made from virgin and recycled rubber covers each cast iron head. The chrome plated handles are ergonomically designed to fit comfortably into the palm of your hands. It is no secret, XMark dumbbells are higher quality. To reduce costs, all of our dumbbells are sold and shipped in pairs or sets. It is a lot cheaper to ship a pair dumbbells instead of singles. Save some money today. You will not regret purchasing XMark dumbbells.