The protection plate is there to keep the outer bristles of the brush straight for a long time. This ensures longer and better brushing for the cows as well as a longer lifetime of the brush itself.
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Red & black bristles
Luna bristles are black, and red. Black bristles are thinner than red ones and once a cow is grooming, a rotating brush with a mix of thinner and thicker bristles provides the cow with a rich brushing experience. It helps to ensure that old hair, dust and parasites are cleaned from cows' skin, that itchy spots are removed and that cows are more relaxed.