Chuckit Crunch Duo Tug is designed to satisfy your dog's instinctual curiosity for sounds. The Super Crunch Ball pairs up two Chuckit Balls with an elastic tug and a crackling, crunchy sound your dogs will love during games of toss and tug. Comes with 2 Super Crunch Balls made from durable elastic synthetic rubber on each end that are connected with a super-strong rope for tugging and twisting fun. Patented crackle safely contained inside ball.