Can't stop the Squeak. Packed with our best selling Invincible Squeakers, the Outward Hound Invincible snakes keep squeaking if punctured. Free from al the extra fluff, these crazy eyed characters have been crafted with what dogs love – Squeakers! Dogs are able to shake, tug and play harder with squeakers that were made smarter. The Invinicble Snake features Chew Shield Technology construction and super strong seams that keep you and your pup pulling and playing longer. A lightweight construction also works great for toss & fetch indoors or out.