Worm Factory 360 WF360B Worm Composter, Black The Worm Factory 360 has a standard 4-Tray size which is expandable up to 8 trays, giving it the largest volume of any home composter. The redesigned lid converts to a handy stand for trays while harvesting the compost. Includes Manual and a Warranty included after product registration. The accessory kit provides basic tools to make managing the Worm Factory 360 easier. Built in "worm tea" collector tray and spigot for easy draining. The Worm Factory 360 has a standard 4-Tray size which is expandable up to 8 trays, giving it the largest volume of any home composter. The redesigned lid converts to a handy stand for trays while harvesting the compost.