3 stackable trays for use with Worm Factory standard model and Worm Factory 360. Go to amazon.com Related posts Where to find worm composter 360? Feature3 Additional Trays for the Worm Factory 360 or Worm Factory StandardExpand Your Worm Farm Today with More Room For HabitatMore Room For Food Means More WormsAlso Can Be Used to Help Separate Worms From Castings