KONG CoreStrength is built to last and is sure to bring excitement while providing extended play sessions along the way. The durable KONG-crafted multilayered core stands-up to long-lasting chew sessions while meeting a dogs natural chewing instincts. The reinforced layers within the core add extra toughness making it great for chewers. The exterior textured words add to the fun and have the added benefit of cleaning teeth and gums. Ideal for independent play and interactive toss and retrieve, KONG CoreStrength is sure to delight the most playful of dogs.