Featuring some of the lowest stack height bearing cover options available, with premium stainless steel Hellbender bearing and 6061 T-6 Aluminum cups and covers, the Hellbender 70 Slam is a premium headset created for riders seeking to lower their handlebars as low as possible without compromising bearing longevity and proper preload.Item SpecificationsBearing TypeCartridgeColorBlackS.H.I.S UpperIS42S.H.I.S. Stem Clamp Diameter28.6 ThreadlessStack Height4.6 Cane Creek Hellbender 70 Slam Upper Headset Headset Upper UPC: 840226090955