Challenge Hoops are made of lightweight wrought iron and come in a set of six with one red top, one blue top, and four all white hoops. They are good quality garden hoops and are recommended for leisure garden play. * Great value hoops for recreational use * Wrought iron with white paint finish * Slightly larger-than-regulation opening: 4.25 inches * Ideal for beginners, casual players, and backyard games * .375-inch thickness