Enduro Bearing MR 18307 LLB - ABEC 3 LLB seals have a double lip riding in a groove, making a labyrinth seal. Grade 10 Chromium Steel balls are twice as round as the industry standard, and High Carbon Chromium Alloy races are vacuum de-gassed, hardened to R-62 and mirror-polished for ABEC-3 precision.
