Can an Invincible be made even stronger? You bet. With new and improved designs featuring double layered seams and Dura Tuff™ material, these Extreme Seam Invincibles are our toughest toys yet. Containing patent-pending Invincibles squeakers, they'll continue to squeak even after being punctured. Why buy squeaker toys that are squeak-less within a matter of minutes? We've created a better, longer-lasting squeaking dog toy, available in sizes ranging from two to six squeakers. If your dog loves to seek and destroy, give 'em long-lasting fun with an Invincibles toy!