Ball Bearing Specifications Inner Diameter: 8mm Outer Diameter: 16mm Width: 5mm Bearing Material: High Carbon Chrome Steel Ball Material: Precision Steel Seal/Shield Type: Metal Shields Lubrication: Long-Life Grease Bearing Reference Number: 688-ZZ Advantage Racing Products Ball Bearings All Ball Bearings are NOT created equal! Over ten years ago we tested a number of different bearing manufacturers, tolerances, and types of lubrication in order to find an optimal balance of performance, life, reliability, and price for our Ball Bearings. We've done the testing so you don't have to! The resulting bearings are OUTSTANDING, and over 250,000 bearings have been sold to satisfied customers all over the world! Advantage Bearings have been run by some of the fastest racers in the world and have won multiple National Championships. All Advantage products are backed by a Satisfaction Guarantee. We guarantee you'll be happy with your purchase, or we will make it right! Precision Steel Metal Shielded Ball Bearings The bearing's races, cages, and balls are made from Precision Chrome Steel, and come packed with a high quality grease. The Metal Shields provide moderate protection, but provides minimum resistance for maximum efficiency and speed.
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