This Chuckit! Fetch Medley Gen 3 has 3 premium Chuckit! Balls, including the classic Fetch Ball, the Ultra Ball, and the new Rugged Ball. The Fetch Ball is not your average tennis ball, this rubber ball is designed for high bounce. The Ultra Ball is the #1 Chuckit! Ball designed to have high buoyancy & high durability for play on land or in the water. The Rugged Ball’s unique ridges increase grip & help keep teeth clean.