USA Made 4-Cell Seed Starting Trays Proudly made in the USA, these larger 4-cell plug inserts are deeper for growing crops that need a little more room. Eight removable inserts fit into a Bootstrap Farmer 1020 tray. Made from food-safe, heavy-duty polypropylene plastic and built to last for many seasons. Easily color code seedlings using these plug trays. Available in black, blue, green, purple, pink, orange, and multi-color packs. The 8-pack multicolor option does not include pink. Features Made from FDA Prime Grade Extra Strength polypropylene (#5 BPA-free) plastic Extra-large 3/4" drainage hole for easy seedling removal Designed with air prune technology to prevent root circling and promote healthy root development Proudly made in the USA and guaranteed to last at least two years Eight inserts fit per 1020 tray and four inserts fit per 1010 tray Ideal for up-potting peppers and tomatoes Not compatible with 1020 or 1010 humidity domes due to a snug fit Dimensions Tray insert measures 5 1/4" x 5 1/4" x 4" tall Each cell measures 2 3/8" at the top and tapers to 1 1/4" at the bottom Air pruning slits measure 2 1/2" long with a slit width of 1/8" Each cell holds one cup of soil. One 4-cell insert uses one quart of soil