The Worm Factory is an upward migration composting worm bin system. It is odorless and is designed to save space and produce an all-natural, nutrient-rich compost for the garden. The Worm Factory is made in the United States from high-quality post-consumer recycled plastics. It is available in three-, four- or five-tray options in black, terracotta and green.from Cascade Mfg. Sales Inc.