With the Nite Ize® FlashFlight® Light-Up Flying Disc, you don't have to choose between fun or performance! Designed by a professional player, this disc performs well anytime with its lightweight, durable build that's well balanced for long, straight flight. Once the sun goes down, this disc has a switch that turns on LEDs with a patented fiber-optic array that ensures the entire disc lights up from every angle. With 4 bright colors and a runtime of 20 hours, the fun extends into the night! The buoyant design means wayward throws can easily be retrieved. Runs on 2 replaceable 2016 3V lithium batteries (included). Dia.: 10.6" x 1.18"H. Wt: 6.53 oz. Manufacturer model #: FFD-08-28. Designed by a pro player with standard size and weight; Flies straight and long day and night; Lightweight, durable construction; Switch illuminates entire disc; 4 bright colors for extra fun; Buoyant design;