Flo Green MonsterJax Solid Limb Dampeners.  The Solid Limb MonsterJax features 6 arms that vibrate at different frequencies to dampen noise and vibration, they are patented.
Solid limb Monsterjax should be placed on the flat part of the limb between the cam and the limb pocket. In many cases 5 - 7 inches down from the cam. Monsterjax should be places so that the arms are parallel to the limbs, you can turn the dampener on top without re-sticking the tape. You'll want to leave the tape down and not move them after pulling the blue backing off.