Bamboo seed trays are made from sustainable bamboo fibre, rice starch & resin made from naturally occurring organic compounds. This material is free from petroleum-based plastics & BPA. It is biodegradable & compostable. The Pots, Saucers & Seed Trays are durable & last for 5 years +. For use indoors & outdoors. Composting the products may take 6-12 months. Breaking the products into small pieces before adding them to your compost heap will help speed up the process. Product Size - L:37cm W:21.5cm Biodegradable Bamboo Seed Tray. Reusable Seed Tray For Sustainable Growing At Home. Microgreens & Starter Tray. Natural Composite