“KONG Core Strength Ball mediumKONG’s new Core Strength is built to last and is sure to bring excitement while providing extended play along the way. KONG’s durable multi-layer core withstands long-term chewing while meeting a dog’s natural chewing instincts.Reinforced layers within the core add extra strength making it ideal for power chewing.The outer textured words add to the fun and have the added benefit of cleaning the teeth and gums.Ideal for independent play and interactive rest and recovery, KONG Core Strength is sure to please the most playful of dogs. Available in 2 Sizes Medium 2.5″” and Large 3″”.”