For areas to which you want to draw attention, use 5-inch curved disks. Curving the disk makes the edges look wider so they emit a brighter glow. Our customers like to purchase them in sets of three, each one a different color. Each disk measures 1/2 inch tall with a 5-inch diameter. The aluminum stem measures 18 inches long and are 3/16-inch diameter. One stem is included with each disk. Stems can be cut or bent to fit your needs.