100% Synthetic The glow in the dark golf balls are very bright, you will have a lot of fun when play them at night. Our LED golf balls are easy to find when playing golf at night, also suitable for Indoor and Outdoor. Constantly On (not flashing)- The golf ball will stay lit for 8 minutes after every activation. It's quite enough time for your collecting them back, Less Balls Being lost The battery lasts 40 hrs, That means you can expect to light up the ball 300 times No charger needed, no UV flashlight needed. Just hit the ball and it lights up on impact and creates a colorful arc as it flies through the air. Each pack has 6 balls each one its own color when lit. Red, Green, Blue, Yellow, Pink, and White. This is the best gift for your parents, friends or children. Give them a birthday, Christmas or thank you gift, let them know what you appreciate, and they will like it. And get a lot of fun from it.Products from NIUNIU's store