About this item Material -- Food Grade PP, sturdy and last for 10 years in outdoor. This Plant Pot is specifically designed for Orchidaceae and Succulents, such as Orchid, Dendrobium, Clivia miniata,Phalaenopsis aphrodite Rchb. F.,Cactus,Lithops N. E. Br.,Zygocactus truncatus (Haw.) K.Schum.and so on. It's also suitable for common plants. Patent Slots that Guides Root Growth -- When orchids become too big for a solid pot,roots begin to circle and choke each other,but Meshpot Patent Slots,can guide the root to grow vertically downwards out of the vents at the sides and bottom,prevent rotting and circling,prunes root structure,promote root growth. Good Air Flow and Excellent Drainage -- The Patent Vents at the sides allow for good air flow;the Patent Vents in the bottom allow for excellent drainage. What You Get -- 4 inner pots,4 outer pots,4 trays(3.5 inches dia.)