Nite Ize manufacturers the brightest glowing night round disc golf discs on the market. These Flashflight discs have bright built in LED lights that utilize a patented Fiber Optic Technology to provide maximum night glow with minimum power output. The Flashflight discs are water resistant and float in the water. They are made of a durable sure-grip material that will withstand the rigors of regular disc golf usage. The Nite Ize discs have a 20 hour battery run time, and the light weight batteries within these discs can be replaced.