Can’t golf at night? Don’t fuss or frown. With a tracer golf ball play after sundown. At eighty compression you really should choose it. Flashes for five minutes after impact so you’ll never lose it. I’m telling you that these balls are great. Its even official USGA size and weight. Product Dimensions: Diameter: 1. 75 in. , 4.5 cm. Packaging Dimensions: Height: 7 in. , 17.8 cm. Width: 2.5 in. , 6.4 cm. Depth: 1.75 in. , 4.5 cm. Twilight Tracer Colors: 1 Red LED Batteries: Batteries are NOT replaceable for these flashing golf balls.