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uxcell 606-2RS Deep Groove Ball Bearing 6mm x 17mm x 6mm Double Sealed High Carbon Steel Z1 Bearings 8pcs: Amazon.com: Industrial & Scientific
625-2RS Bearing 5x16x5mm Double Rubber Sealed Miniature Ball Bearings 625RS for VORON Mobius 2/3 3D Printer (Pick of 10Pcs): Amazon.com: Industrial & Scientific