Nature's Footprint WF360BW Worm Factory 360 4 Tray with Worms, Black US made high quality post consumer recycled plastic. Houses thousands of worms that consume pounds of waste per week. Compact and expandable up to 7 trays. Color: Black Each tray has a grid bottom, so worms migrate upward as new food is added. As waste is broken down, moisture filters through the system, taking nutrient-rich particles with it The worms will process food waste into fine compost full of nutrients; when the first tray is full, simply stack another on top and harvest your Vermicompost from the worm free bottom tray Worms can eat about half their weight in food per day. If you start with 1 lb of worms, they can eat a half pound of food per day. Worms can survive up to two weeks without any additional food 5 year limited warranty. Odor free operation. Create compost year-round, indoors and out