BUILT FOR TOUGH CHEWERS. The New Boundr™ is the perfect ball for active dogs' who like to chew, fetch, chase, and chomp. Boundr's hollow core and light-weight design allows for satisfying squishy chomp sessions and endless games of fetch. Fits into a standard size ball thrower and has a fun texture for easy hand-throwing and is safer and tougher than a tennis ball and Boundr floats!