688-2RS Bearings, 8x16x5mm Ball Bearing 688RS Double Rubber Sealed Shielded Bearing ID 8mm, OD 16mm, Thickness 5mm Pre-Lubricated Deep Groove Ball Bearing for 3D Printer, Scooters 4pcs: Amazon.com: Industrial & Scientific
10pcs 688-2RS Ball Bearings Set, Rubber Sealed Deep-Groove Ball Bearings Metal Bearing for Small Hobby 5mm Shaft or Rod Projects, 8x16x5mm: Amazon.com: Industrial & Scientific