The sun may be going down, but why should fetch time be over? Glow-in-the-dark Fetch Balls by Sport Pet keep the fun going by being easy to find in low-light conditions. All it takes is a brief burst of light under a lamp, your car's lights, or even the light on your cellphone and they glow well enough to find in an evening grassy field. They're compatible with most ball launchers and a proper replacement for tennis balls, except there's no slobber-soaked felt cover to handle. Comes in a set of 8, so you can pack some in a park bag or glove compartment, leave a few at home, and still never be without a replacement. Bring a set home and let the fun roll on after dark!