GoughNut Ball Black 50 - GoughNuts chew toys are designed knowing that safety and fun go hand in hand. Each GoughNuts Ball is designed with a multi-axis groove system for the purpose of helping to aid in breathing in a worst case scenario air blockage situation. Sizing is the most important factor and therefore be sure the ball is large enough for your dog (the ball is 3 inches in diameter). The GoughNuts Black is guaranteed for life. If the ball becomes damaged follow the instruction in the guarantee section of our web site. Safety is our main concern. The GoughNuts Black Ball 50 is our most durable ball. This ball will bounce less that our other ball products. This "50" will not float. You want this ball simply because you need/want a more durable GoughNuts Ball The GoughNut Ball Black is an interactive toy, not for constant chewing!!!!!!! Our Original GoughNut Rings design are the most durable design and should be used for power chewing.