Body is plastic.  Unit has very cheap feel to it.  
Instructions are useless.  Took almost an entire day to install because instructions assume cheap plastic parts will fit well into your sink.  They don't.  
Since I needed my faucet to work, I installed it on a Sunday, the day the hardware was closed so I couldn't return it for a replacement. Had to buy replacement drain spout so I could get a gasket that sealed properly, and to use a copious amount of teflon tape to seal drain body into flange and jam nut.  
If you must buy one of these, watch a few youtube videos to learn how to properly install a plastic drain because the Moen instructions will leave you wet and frustrated.