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Each Helo speed bearing is manufactured with the best materials, technology and craftsmanship available. Polished raceways and high-speed lube provide a quiet spin while increasing performance under the toughest conditions. Helo precision speed bearings are pre-spun at the factory to ensure the tightest tolerances are maintained. All bearings meet or exceed standard specifications. Quark bearings have a high precision glass reinforced nylon cage, deeper grooves and an ultra-high performance speed lubrication for the fastest, most precise roll available in the market today. They are well beyond Swiss in precision.