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
20 Pack 608 ZZ Ball Bearing, Bearing Steel & Double Iron Sealed Miniature Deep Groove 608
608-2RS Ball Bearing, 8x22x7mm ABEC-9 Blue Sealed with Grease Bearings, High Stability 608 RS for Skate ( Pick of 8 Pcs ): Amazon.com: Industrial & Scientific