Cane Creek Hellbender 70 30th Anniversary Bottom Bracket - English, For 30mm Spindles, BlueThe Hellbender 70 bottom bracket utilizes bearings made of 440C stainless steel, providing exceptional ride quality and reliability, while striking a perfect balance between value and lasting performance. Marine grade grease and robust bearing seals complete the package in terms of durability. 440C stainless steel bearings with a dual lip seal and marine grease, offer durability and corrosion resistance 6061 T6 machined aluminum cups are lightweight