The Midnight Sun flying disc is the brightest and longest-lasting glow-in-the-dark disc ever made. A side-by-side comparison with any other disc will convince you. In order to properly activate the glowing properties of the Midnight Sun disc, we recommend a portable spotlight. A few seconds under the spotlight will activate the phosphorescent properties of the Midnight Sun disc and produce a moon-like glow that you have to see to believe. The white disc pictured is a representation of the disc under normal lighting conditions, while the green discs are representations of what the disc looks like glowing in the dark. The Midnight Sun disc is 8-3/4" in diameter.