Ball bearing, black rubber sealed (20x27x4mm) (2)
https://www.ludingtonhobbies.com/shop/5182a-ball-bearing-black-rubber-sealed-20x27x4mm-2-18633
https://www.ludingtonhobbies.com/web/image/product.template/18633/image_1920?unique=7165822
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Manufacturer's Part #: 5182A
