USA Made 4 Cell Trays in Color! Proudly made in the USA, these larger 4-cell plug inserts are deeper for growing varieties of crops that need a little more room. Eight of these removable inserts fit in a Bootstrap Farmer 1020 tray. Made out of food-safe, heavy-duty polypropylene plastic and built to last many seasons. Color code your seedlings in these insert plug trays. Available in black, blue, green, purple, pink, orange, and multi-color packs. Features Made from FDA Prime Grade Extra Strength Polypropylene (#5 BPA free) plastic Extra Large 3/4" Drainage Hole makes for an effortless seedling removal.  These 4 Cell Inserts are designed with Air Prune technology. Air channels are added on each side to prevent root circling. Air-pruned roots are shown to provide healthier and more vigorous growth.  Proudly made in the USA, our Seed trays are guaranteed to last at least two years. Eight inserts fit per 1020 tray, 4 inserts fit in a 1010 Perfect for up-potting peppers and tomatoes. Not compatible with 1020 and 1010 humidity domes as fit is snug.  Dimensions Seed tray insert 5 1/4" x 5 1/4" x 4" tall  Each cell in the tray insert is 2 3/8" on top, which tapers down to 1 1/4" at the bottom. Air pruning slits measure - 2 1/2" long -  slit width is 1/8"