It's a little rubber gasket that you put in your sink to catch hair and everything else before it clogs it up.
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The Sink Shroom also prevents jewelry from falling into your drain.
If you have a stopper, you have to remove it first, and then you insert the rubber gasket.
The Sink Shroom sticks out about an inch.
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After a couple of days and the water running, you pull it out and there will be hair and other debris that you simply clean off.
It may be a little gross at first, but it will prevent your drain from getting clogged.
For less than $15, I'd say it's totally worth it!