Backed by a 110-year warranty and constructed in Fletcher NC the 110-Series headset is designed with no compromises in quality durability or finish quality. Integrated bearings fit directly into compatible head tubes without the need of a bearing press.Sealed stainless steel bearingsCarbon-friendy compression ring captured in top cover keeping shims in place7075 T-6 aluminum cups machined in Fletcher NCAluminum dual seal crown race protects lower bearingInterlok spacer compatible110 year warrrantyUses 36/45 degree crown race and compression ring SPECS Color Black Lower Stack Height 1 Bearing Type Cartridge Crown Race 40 Defined Color Black Upper Stack Height 9 S.H.I.S Upper IS41 S.H.I.S. Stem Clamp Diameter 28.6 Threadless S.H.I.S Lower IS52 Size IS41/28.6, IS52/40