Satisfy your dog's natural chewing needs with the savory & delicious Barkworthies Beef Fillet Knuckle. 100% natural, FDA approved and sourced from free-range and grass-fed Brazilian cattle, these treats are a great source of natural calcium. Thinly sliced knuckle bone provides access to the marrow, giving your dog quick satisfaction and taste. Durable and long-lasting chew helps promote dental health by scraping away tartar and plaque. Single ingredient chew is free from additives, chemicals and preservatives. Made in the USA.additive-free, chemical-free, and preservative-free.