A99 Golf Twilight Light-up Flashing Golf Ball 6Pcs Mixed Color - Play Night Golf Great Performance - far superior to "glow stick" balls Flashes BRIGHTLY for 5 minutes after being hit LED Green, Red, Blue Flash is impossible to miss - find it anywhere! Twilight golf ball has revolutionized playing golf past dusk and at night. Diameter: approx. 4.24cm; Circumference: approx. 13.3cm. Color: Green, Red, Blue. Quantity: 6pcs/set, (2pcs for each color)