Nite Ize Hole-in-One White L.E.D. Disc Retrofit Enter your model number above to make sure this fits. Easily retrofits any disc golf disc to illuminate it for nighttime play Easily replaceable batteries included 2x 2016 3V Lithium Will not alter flight characteristics Easily retrofits any disc golf disc to illuminate it for nighttime play Easily replaceable batteries included 2x 2016 3V Lithium Will not alter flight characteristics Flash or glow modes Bright white LED illumination