WOW. You'll love playing with this ones.WOW. You'll love playing with this Oddballs.These 68mm juggling stage balls use 3 x LR44 batteries which should give four to five hours glow. Excellent light diffusion and a fantastic ball for the price.These are professionally weighted LED juggling balls. Oddballs LED juggling balls are tough enough to survive lots of drops on tough surfaces - The batteries are available in most hardware shops or supermarkets. The battery chamber is sunk inside the ball - you activate the balls by turning the covering screw cap which sits below the surface of the ball. At 155g these balls are a great juggle and the weight feels well distributed around the ball to give it a neutral flight. The light dispersal is also great - use these balls at night for best effect. Each ball comes with batteries.Please note you have to remove the protection between batteries before first use