The Chuckit Ultra Ball is a natural rubber ball that enables highly enjoyable games with your dog. With little effort, each Ultra Ball will bounce high up for your dog to catch, and what's more, they float too! The ball is also easy to clean so you can always keep it in good condition. Medium balls fit medium-sized Chuckit ball launchers such as the Ultra Grip Launcher and standard tennis ball throwers. Each pack contains 2 balls. These balls have a high bounce, long range, and are made of ultra-durable natural rubber. They are also ultra-buoyant for water use and easy to clean. The Chuckit Ultra Ball is a premium quality ball available in different sizes: Small - 2" diameter, Medium - 2.5" diameter (same size as a tennis ball), Large - 3", and XL - 9cm.