LIGHT & DURABLE: Large Stacking planters that are made to last. These vertical gardening pots are used by Commercial Growers and Universities. Made Of Food Safe High-Grade Polypropylene (#5). Material is strong, flexible, and lightweight. Option to Add Center Pipe For Added Support or DIY Vertical Garden Project. Drainage holes are included for top-down drainage and watering. The maximum recommended height with the support pipe is 10. SMART: Just Water The Top - All Tiers Below Recieve Water. The trays were designed with inner holes to support the drainage. EASY MAINTENANCE: This is 20 Plant gardens in 1 Location. You can mix the plants and enjoy watching them grow. For Homes, Apartments, Greenhouses, Classrooms, Backyards, and Patios - Grow Strawberries, Flowers, Herbs, and Vegetables Vertically. QUANTITY & SIZE: Available in 5-Pack Soil Volumes 64-Quarts (18" Diameter x 38" Height) and 24 Quarts (13" Diameter x 28" Height) - Made in the USA - Heavy-Duty - Includes 5 Large Stacking Planters - Color: Terracotta Orange (Darkens A Bit Once Soil Is Added). The middle pole must be purchased separately. The bottom tray is included in 24-quart (S) size only.