A natural rubber ring toy that utilizes engineered carbon reinforcement for added durability. The two layer design is built with a red safety indicator that lets pet parents know it is time to take the toy away from your furry friend. The black recipe is stronger than both the green and orange recipes. A great chew toy option for very aggressive chewers Easy to clean: just use warm water to wipe goughnuts rings clean after a long day of playing Medium "original" black ring Dimensions: 1.75 cross sec/5 inch diameter Suitable for dogs 30-70lbs Durability scale score: 85.