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
JSB Great Bearings 6204-2RS Rubber Seal Rs Ball Bearings 6204Rs Abec1/C3: Flange Block Bearings: Amazon.com: Industrial & Scientific
R166 ZZ Bearing, ID 3/16 inch x OD 3/8 inch x 1/8 inch Miniature Ball Bearing, Metal Shielded and Pre-Lubricated with Grease, 3/16 inch Precision Roller Bearing (10 Pack): Amazon.com: Industrial & Scientific