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. Zero stack uppers press into head tube with very little stack height. Lowers are either zero stack or external cup.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 warrranty TECH SPECS Color Black Lower Stack Height 4 Bearing Type Cartridge Crown Race 40 Defined Color Black Upper Stack Height 8 S.H.I.S Upper ZS44 S.H.I.S. Stem Clamp Diameter 28.6 Threadless S.H.I.S Lower ZS56