Our fully enclosed wheel nuts (aka Monkey Nutz) are made from a unique blend of Kevlar reinforced ballistic grade polymers with added impact modifiers. An enclosed wheel nut will keep the dirt out and protect the exposed thread area from impact damage. The material also benefits your vehicle by absorbing impact energy, thus lessening the amount of impact energy transferred through to the hubs (damaging threads). This reduction of impact energy can also prolong the life of your hub carriers, and reduces fatigue of the hub carrier bearings.