Chuckit max glow ball is a great toy for any dog that enjoys evening walks but cant go without a game of fetch with the exclusive max glow technology this ball glows green for up to half an hour making the ball easier to keep track of at night the ball is made from a high quality luminescent rubber which absorbs light and then emits a light green glow shine any light onto the chuckit max glow ball for just 5 10 minutes and it glows in the dark for approximately 20 30 minutes this helps