I have two dogs. They love to chew, especially anything "boney". These were relished initially (I bought them one each to stop fights). I decided, however, to wait a couple of months to give an objective accurate review.
The bones, at their ends, once chewed for a couple of days, develop sharp ridges which stop the dogs persevering with a chew as it hurts their cheeks and gums.
I have sanded these bones down in my work shop and the dogs started chewing the bones again. However this is not a solution. The solution would be a more suitable nylon material that flakes off and does not produce razor sharp edges once chewed.
I think try an alternative product.