The base is a galvanized steel framework that sits inside the shed, the purpose of this base structure is to keep the goods inside the shed off the ground. You always have the option not to use the base framework and set up shed directly onto the ground. Providing a strong secure storage solution at a very favorable price. Painted galvanized steel sheet Valuable storage space Space saving option even for small areas Metal base, Ventilation Dimensions: - 6ft x 4ft - Pent roof: External Size:1210mm x W1940mm x H 1820mm - Door H: 1540mm, Total H: 182cm, 2 Air Vent Bottom Size: 1090mm x W1830mm - Door H: 1540mm, Total H: 182cm. Due to the difference between different monitors, the picture may not reflect the actual color of the item.We guarantee the style is the same as shown in the pictures, but not the same performance on different bodies as on the model. Actual size may be slightly 1-2cm different due to manufacturing tolerances. Please wear protection gloves when installed. Due to courier restrictions some areas out of uk mainland require a small surcharge - please note that, thanks!