Ball bearings, black rubber sealed (17x23x4mm) (2)
https://www.ludingtonhobbies.com/shop/5098a-ball-bearings-black-rubber-sealed-17x23x4mm-2-18541
https://www.ludingtonhobbies.com/web/image/product.template/18541/image_1920?unique=7165822
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Manufacturer's Part #: 5098A
