Made with a stainless steel clicker element that will not rust. Can also be attached to a keychain or lanyard (not included). Includes a free step-by-step training guide Features a unique shape that your dog can lick, chew or gnaw. Special dental ridges and chew action help remove tartar. This product is intended for intermittent or supplemental feeding only. With all chew products and treats, pets should be supervised as no product is completely indestructible.