Designed to fit our stackable Wood Worm Composter, this tray provides additional room for green waste to increase your yield of compost. Layer multiple bins to create even more compost. Crafted of reclaimed solid pine with beautiful natural blue streaks originally created by wood-eating beetles (no longer in wood). Wood allows excellent air circulation, keeping worms healthy and contents odorless. Handcrafted in USA. A Williams-Sonoma exclusive.