Just buy unshielded open bearings if you are OK with muck getting in. Buy fully sealed bearings if you want to keep everything out of them.
https://www.mcmaster.com/products/ball-bearings/bearing-seal-type~open/
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i think it helps for air to get in there, so that muck can go in and out
replying the reply with some air
replying the reply of the reply
go call