The Worm Factory® 4-Tray Recycled Plastic Worm Composter - Black is like a capsule hotel in Tokyo … except the guests are 6,000 worms and it goes in your backyard. Made from 100% recycled plastic, this composter allows worms to happily nosh 24/7 on your kitchen waste and whatnot, providing you rich organic material. Odorless, well-organized, green … and best of all, the worms will eat your junk mail. Or bills. What is The Worm Factory® and how does it work? Unique and ingenious, the Worm Factory® is composter comprised of stacking trays in which worms eat your scraps and leave behind rich organic material. Fill each tray with scraps like vegetables, fruits, egg shells, coffee grounds, paper, and junk mail, and in turn you'll get nutrient-rich compost for your garden. Worm castings are known to be the very best compost available