Wolf Tooth headsets are machined here in our Minnesota shop with aircraft-grade 6061 aluminum. They are designed to be lightweight, strong, and durable. Performance Headsets with Enduro black oxide bearings have a one-year warranty. 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. These EC headsets are for frames with external bearing cups, which places the bearing outside of the frame. COMPATIBILITY Stack height designation for EC headsets includes 10mm cup (see tech specs). Any frame that uses an external cup headset with a 49mm head tube inner diameter. Uppers and lowers sold separately. Enduro black oxide steel sealed bearings included on both the upper and lower. Upper headsets ship with a star nut which can only be used on forks with steel or aluminum steerer tubes. For forks with carbon steerer tubes you will need a compression plug (sold separately). (Never use a star nut on a carbon steerer tube). FEATURES Custom molded dual-lip seal on the crown race to protect lower bearing in the toughest conditions. 12.25mm stack. Service and additional parts available. SPECIFICATIONS Weight: 54g Material: 6061-T6 aluminum Made in the USA The Story Wolf Tooth was founded to design and manufacture precision cycling products that emphasize function, performance, and reliability to meet the needs of our fellow racers and riders. We are a group of cyclists in Minneapolis, Minnesota that spend a lot of time talking about bike components. Like most detail-obsessed riders, we're always looking for new products that could make our bikes lighter, faster, more versatile, or more reliable. We pride ourselves on delivering premium products of the highest quality.