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Hushers are molded rubber pieces that fit around the valve stem and contact the underside of the cam follower (lifter) In theory they are supposed to provide a cushion before the follower makes contact with the valve stem. Zero lash, sort of?
The get brittle over time and may fracture but will not cause any damage. I installed one set and could not notice any improvement so far as noise reduction.
If you install them I suggest adjusting the valves first then R and R the cam and replace the hushers since they make it difficult to get a good reading on the clearance.
Probably not worth the effort IMO.
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