PLUBBER is the newest technology for Pet Toys! Made to last, PLUBBER Toys are filled with super strong aerated rubber which bonds to the outer shell material of the toy. Many Plush Toys are destroyed in seconds by aggressive chewers, but not PLUBBER. And there is no Poly-fill in PLUBBER. Because of its patented technology, PLUBBER Toys are rubber tough and built to stand up to the toughest of chewers!