This is a multi-colored rainbow silk streamer that changes to black with just the shake of a wrist. Or do it in reverse so a black streamer becomes multi-colored. Use it in a stage act for a quick visual color change. I use mine with the coloring book routine. I shake the colorful streamer over the heads of the children, and as they grab the invisible colors, the streamer turns black. Then the children throw the invisible colors at the book! The streamer is approximately 4 feet long, and 6 inches wide, made of silk. This particular silk is smooth in working and easy enough for a beginner to master in a matter of minutes.