Happy Customer. We Big Teeth has been committing to golf items for about 6 years and these led golf balls are a lifetime warranty from the manufacturer. if the item you received is defective, such as not lighting up, please feel free to contact us for a full refund or reshipment, we will ensure you are a happy customer. Enjoy Your Night Glow Golf. Glow in the dark golf balls can constantly glow for about 6-7 minutes per hit with a quality 5050 led core. The battery inside will last about 50 hours in total. Great for fun with buddies and family, kids' golf practice,night golf, gifted idea etc. Durable And Smooth Playing Golf. Glow golf balls are made of US surlyn material and a high elastic rubber layer. These light up golf balls perform like normal golf balls, so won't have any negative effect on your game. A smooth surface makes night golf balls comfortable to use. Light Up Easily. Glow in the dark golf balls are certified by Big Teeth Golf 500 times strike test.They are solid white you just need to strike the glow golf balls against the ground then they will light up colorful. And each glow golf balls in the dark was tested to insure light up before being packaged. Easier To Find In The Dark. Our glow golf balls glow super bright and colorful after being hit, which means that you can easily find these glow in the dark golf balls. Stop searching for your light up led golf balls at dusk and have fun in night golf.