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Sealed means rubber or similar SEALS. Shielded has a metal shield, that will keep the bumble bees out. You will really want sealed, usually specified as a number plus 2RS. Meaning 2 rubber seals
A shielded bearing has metal shields to help hold the grease in but can still weep out and let moisture in. A sealed bearing has rubber coated shields to hold all grease in and keep all elements out. Use a 2 sided sealed bearing.
If your talkin wheel bearings, then take them back and trade em in for sealed, both sides, usually designated 2RS on the end of part number...eg 6205-2RS
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