Stainless steel headset angular contact ball bearing with 52mm OD x 40mm ID x 7mm Width - 45 x 45 degree.
These all-stainless bearings offer great corrosion resistance and strength. Superior sealing system ("Split Lip") and marine duty grease offer great corrosion resistance. This bearing is a drop-in replacement for Campy internal headsets, and many Specialized frames with head tubes for tapered forks.
LLB Seals: Enduro Bearings use LLB type seals and CRC Marine Grease in their 440C Stainless Steel bearings, their most popular seal type, this is a Nitrile material rubber with a steel insert. Rather than the standard 2RS type seal, Enduro go a step further by machining a groove into the inner race where the seal can rotate with better efficiency and less rolling resistance. Rather than one thick seal lip rubbing on a blunt surface, LLB type utilizes two razor thin sealing lips riding in the groove with light contact. The outside lip keeps the water and contaminates out, while the inner seal retains the grease for smooth function and long intervals between servicing.