The ultimate mountain bike frame suspension pivot bearing - all the advantages of stainless steel with a far greater load carrying capacity - jump higher faster and longer! Designed specifically for suspension pivots, Enduro Bearings pioneered MAX type bearings almost 20 years ago for bicycles to address the challenges associated with mountain bike pivots. These bearings have 35-40% more load capacity than standard radial bearings. We accomplish this with a special design where the maximum number of balls are inserted into the bearing. The race grooves are deeper on these bearings for more lateral support for the twisting and multiple forces associated with mountain bike pivots. LLU seals give maximum protection against the elements, while keeping the 90% fill of Almagard Extra High Pressure Grease inside. With the corrosion resistance close to stainless steel, with the advnatage of a much higher load capacity - You really can't get a better bearing for mountain bike suspension pivots! LLU - Is a double lip seal making medium contact, and also rides in a groove making a labrinth seal (reducing friction for less rolling resistance Grade 10 Chromium Steel Balls: High precision balls are within 10/1,000,000″ round, twice as round as the industry standard, at it’s highest level. 52100 High Carbon Chromium Alloy Races: Vacuum de-gassed process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable. Polished to a mirror finish for ABEC-3 precision and noiseless movement. Riveted Steel Retainer for toughness, ABEC-3 tolerances and noise tested, C-3 or C-N Internal Clearance Always install bearings by pressing on the outer race only into a housing   The cross section image above represents the internal structure of the max load bearing - please refer to the above image for the exact part supplied.