Cane Creek Hellbender 70 Slam Upper Headset - IS41/28.6/H4.6 Black. 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.