Chuckit! Tennis Balls are made of high-quality materials and specifically designed for the game of fetch. Constructed from natural rubber and featuring an extra-thick rubber core and durable material that floats in water. The bright colours provide improve visibility during play and help to prevent the ball from being lost. Use alone, or with any Medium sized Chuckit! Launcher. These high-bouncing tennis balls are available in sizes small; medium; large; and with one; two; and four-pack options. The Chuckit! Tennis Ball’s soft felt surface is also gentle on dogs’ mouths for comfortable carrying.