Some of them have rubber bone accents on them, too, so your dog can enjoy different textures. (geekwrapped.com)
It contains a soft rubber bone with raised ridges for chewing, and a short knotted rope for pulling. (thehappypuppysite.com)
To avoid that you can buy them toys such as rubber bone or a soft toy that can easily fit in their mouth so that they can chew it all day long without getting bored or damaging other stuff in your home. (bestpets.co)