Kong® Air Dog Toys Have Squeakers For Added Playtime Fun Kong Air Dog Sticks are made with the same high-quality, rugged synthetic felt material as standard tennis balls. Constructed in a variety of wild shapes, these fetch toys never bounce the same way twice! Air Toys are heavy-duty to withstand the roughest abuse, yet the soft felt cover is gentle to dogs' teeth. They're non-toxic, easy-to-clean, brightly colored, squeak when squeezed, and they float! Perfect for fun in any condition.