These replaceable knobs are one of the things that make these boots better than all the rest. YOU CAN REPAIR THEM. My horse has had her scoot boots for almost three years because we can repair the normal wear and tear. That said, these boots are so durable that this is the first time we’ve replaced the knob hooks. I’ve had other boot brands that are ruined in 48 hours and nothing is repairable. I’ll be a loyal scoot boot fan for my barefoot horses FOREVER.