- KONG Flexball is built from a durable material that makes playtime last. Ideal for satisfying natural chasing and retrieving instincts. It also has a flexible shape that rebounds after chewing, all adding up to long-lasting play sessions. Grippable handles are great for games of tug-of-war and have the added benefit of being easy to pick up for interactive fetching fun. An erratic bounce and an easy-to-clean exterior make this toy one that is sure to delight.