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 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 Bal unique ridges increase grip & help keep teeth clean.The Ultra Ball is the number 1 Chuckit! ball, designed to have high buoyancy and high durability for play on late or in the water. The Fetch Ball is designed for high bounce. The Rugged Ball unique ridges increase grip and help keep teeth clean! Its also exclusively available in this multi-pack.