worm box turns your green food scraps into compost Stack and red wiggler worms odor and excessive moisture. Crafted of reclaimed solid pine with beautiful natural blue streaks originally created by wood-eating beetles (no longer in wood). Uses upward-migration system of rotating stacking trays: as the worms consume and process waste, they move up through the composter to new food sources. base, aluminum drip pan, lid and three trays.