MroMax Roller Idler Bearing Pulley-3 x 15 x 4mm Sliding Conveyor Nylon Wheel with 623ZZ Bearing for Furniture, Hardware Accessories and Mobile Door White 4Pcs: Amazon.com: Industrial & Scientific
Kugellager 15,875 x 6,35 x 4,97 mm (5/8" x 1/4" x 13/64") R4 ZZ Rillenkugellager : Amazon.de: Gewerbe, Industrie & Wissenschaft
Electric Motor Quality Deep Groove Ball Bearings - Veercom
Amazon.com: Rollerex 20-Pack, 608ZZ ABEC-1 Wheel Bearings (for Any Products Using Roller Skate Wheels) (Carbon Steel) - for Inline, Rollerskate, Skateboard, RipStik & More : Sports & Outdoors