Feature:   1. It emits bright fluorescence in the dark, allowing players to quickly and accurately locate the ball at night. 2. No battery is needed. Charged by sunlight and flashlight, it automatically absorbs light and glows in dark places. 3. In balls, there are dual fluorescent layer, making them brighter than other balls and giving them a longer light‑emitting time. 4. The inner layer is synthetic rubber and the outer layer is synthetic resins and fluorescent powder, they are no different from ordinary balls in terms of quality and feel. 5. This is the perfect gift for lovers, family, business partners or close friends, they will like it!     Specification:   Item Type:   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:   8 x   Balls