10-Pack Loose Ceramic Si3N4 Balls 16.669mm = 21/32" G20 Bearing BallsLoose Ball Bearing 16. 669mm = 21 32"inch Ceramic Balls Si3N4 10 Balls 21 32" Loose Ceramic Balls Si3N4 (Silicon Nitride), this is a popular size that could be used in many Bicycle, Balls are made from high strength Ceramic Si3N4. Loose Balls Size: 16. 669mm = 21 32" inch Material: Si3N4 (Silicon Nitride) Quantity: Pack of 10 Balls VXB Category: Loose Ceramic Balls
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