Quality aluminium. Green-coated framed. Will not rust, fade or tarnish. Includes 1 roof vent - as illustrated. Fully Guaranteed BASE Galvanised steel base Green coated Easier than making a brick base. Simply bolt together. Provides a secure and level foundation for your greenhouse. Gives an extra 5" (13cm) of head room. POLY CARBONATE GLAZING Twin wall construction. Safe, light and easy to handle. Easy to install. No danger to children and pets. Diffused to prevent scorch ideal for young and delicate plants. More even temperature. Better winter frost protection. Earlier flowering and crops. UV treated for a longer life.