Hoyt had been producing something similar to them several years ago. I had a set of the split limb models on the my Havoc Redline for a time. They are still sitting in my gadget cabinet. They seemed to work " ok" but not anywhere near as well as some of the other noise/vibration reducing gadgets on the market. What I really liked about them was that they protected the bow limbs from nicks and scratches while hunting. It made resale somewhat easier to say " not a scratch on it" .....