This ABEC-3 Radial Bottom Bracket bearing boasts 52100 High-Carbon Chromium alloy races paired with grade 10 balls, filled to 90% with high-pressure, waterproof grease. Primarily used as a replacement for MX BBs from Profile Racing, Enduro's bearings come in various materials like high-carbon chromium steel, 440C stainless steel, ceramic-hybrid, and XD15 with ceramic or stainless balls. Engineered with the deepest groove races to accommodate large balls, these bearings feature dual-lip seals riding in a micro-groove, forming a full labyrinth for superior protection against elements.