SUNPACK 6-Cell MEGA Tray Insert Squares are made from premium Food-Grade, and BPA-Free plastic. 12 inserts fit into a standard 1020 (10in x 20in) tray. These inserts provide 6 individual cells for starting seeds or cutting and allow them to grow perfectly well overtime! SUNPACKs trays are made from durable and reusable materials. These inserts allow for easy transplanting of seedlings and cuttings. The inserts come with holes which allow and promote healthy root growth. Try it out today!