R3-2RS Bearing Miniature Ball Bearing 3/16x1/2x0.196 Inches Both Sides with Rubber Sealed and pre-Lubricated with Grease: Amazon.com: Industrial & Scientific
XiKe 2 Pcs 6206-2RS Double Rubber Seal Bearings 30x62x16mm, Pre-Lubricated and Stable Performance and Cost Effective, Deep Groove Ball Bearings.: Amazon.com: Industrial & Scientific
1-Pack] S6309-2RS - Stainless Steel Deep Groove Radial Ball Bearing 45 mm x 100 mm x 25 mm (ID x OD x Width) with Double Rubber Seal: Amazon.com: Industrial & Scientific