The Hellbender 70 bottom bracket utilizes a bearing made of 440C stainless steel, providing exceptional ride quality and reliability. The stainless steel bearing in the Hellbender 70 strikes a perfect balance between value and lasting performance. Highlights: 440C Stainless steel bearings Machined aluminum cups Excellent durability and corrosion resistance 1-Year Warranty Precision engineered in Fletcher, NC The Hellbender 110 Ceramic uses the highest level of bearing technology available. The finest level of Hellbender bottom bracket provides an incredible mix of performance and longevity through the inclusion of Enduro XD-15 ceramic bearings. These bearings feature nitrogen-infused stainless steel races that will not rust or corrode paired with Silicon Nitride ceramic balls. Silicon Nitride is many times harder than steel, and as a result, increases the lifespan of this bottom bracket dramatically. Highlights: 100% Lifetime Guarantee Enduro XD-15 ceramic bearings Machined aluminum cups Kluber NBU52 Grease