Each light is laser cut and comes with an LED light base in black or white. Bases are 4 inches in diameter. The color of the light can be changed by pressing the button on the top of the base. There is also a setting that flashes between all of the colors, and one that fades gently between all of the colors. Glowlightz are a great way to dress up your sewing room, and make great gifts for your quilting friends!