Wolf Tooth Premium Internal EC44 Headsets were developed for frames using the ENVE IN-Route System of cable integration with a 44mm head tube. It was made for cyclists who want a clean, aero cockpit that keeps cables and brake lines out of sight. Wolf Tooth headsets are machined with aircraft-grade 6061 aluminum at Wolf Tooth in Minnesota, USA.Designed for the ENVE IN-Route System with a 44mm straight headtube and a 1-1/8 to 1.5 tapered steerer tube (FITS ONLY ENVE In-Route System)This Internal headset helps reduce aerodynamic drag by hiding cables away from airflow, and presents a svelte profile with its ultra-low 15.8mm upper and 12.25mm lower stack heightFeatures Wolf Tooth's best-in-class triple-sealed system to protect the premium Enduro stainless steel bearings from the elementsInternal o-ring top cap seal prevents water intrusion around the steerer tubeUses the largest possible ball size and are filled with high-pressure waterproof lubricantItem SpecificationsBearing TypeStainless SteelColorBlackCrown Race40Defined ColorBlackLower Stack Height12.25MaterialAluminumS.H.I.S LowerEC44S.H.I.S UpperEC44Upper Stack Height15.8Weight116 Wolf Tooth Premium Internal Headset for Enve In-Route System Headsets UPC: 810159400602