Each ball is built around an extra-thick natural rubber core wrapped in a durable polyester felt covering, giving it a bounce and grip that differ from a standard tennis ball. The rubber core lets the ball float, so it can be used for fetch on land or retrieving games in water. A two-tone orange and blue finish keeps the ball visible in grass, sand, or water so it is less likely to be lost during play. The ball can be thrown by hand or loaded into a correspondingly sized ChuckIt launcher, which is sold separately. No assembly is required; the ball is ready to use straight out of its packaging. Because dogs vary in how hard they chew, play should be supervised until it is clear the ball will hold up to a particular dog.