Tubular steel and polyresin construction. Features 4 shelves for pots and seed trays. Slatted shelves allow for proper drainage. Assembles easily in minutes. Measures 2.9L x 3.5H feet. Keep your greenhouse organized and functional with the Gardman 4-Tier Greenhouse Staging. Constructed of tubular steel and polyresin this staging will handle the humidity sun and moisture of a greenhouse beautifully. There are four shelves for storing pots and seed trays. Assembly is quick and easy.