Item Type: Glow Golf Balls Inner Material: Synthetic Rubber Outer Material: Synthetic Resins + Fluorescent Powder Product Color: As Pictures Shown Product Diameter: Approx. 42.67 mm/1.7 in Product Weight: Approx. 485g Wind Tunnel: 332pcs Features: Automatically absorb light and emit light in dark places. Package List 12 x Glow Golf Balls 1It emits bright fluorescence in the dark, allowing players to quickly and accurately locate the ball at night. 2No battery is needed. Charged by sunlight and flashlight, it automatically absorbs light and glows in dark places. 3In golf balls, there are dual fluorescent layer, making them brighter than other golf balls and giving them a longer lightemitting time. 4The inner layer is synthetic rubber and the outer layer is synthetic resins and fluorescent powder, they are no different from ordinary golf balls in terms of quality and feel. 5This is the perfect golf gift for golf lovers, family, business partners or close friends, they will like it