Wolf Tooth Premium Internal Headsets for ENVE IN-Route System are designed and machined right here in our Minnesota headquarters with aircraft-grade 6061 aluminum. They are designed to have an ultra-low stack height, to be lightweight, and durable. Our headsets have three levels of industry-leading custom sealing to protect bearings from the elements and prolong the life of the headset. Available in a variety of colors. Premium Headsets with Enduro stainless steel bearings carry a lifetime warranty.