Our frames are iron structures, painted in the furnace and each of these is identified by the diameter, which is the maximum horizontal distance between the outer most vertical elements of the frame. The frames are organized by model and within each model there are the various measures available. In order to help you to understand the necessary amount of fabric or PVC, the basic measures were added and the maximum height of each frame in the descriptive section. The ferrule is the element to connect the frame to the base, their measurements are standard: E14 (1.4 cm) - small ferrule and E27 (2.7 cm) - big ferrule. If you need a small ferrule, instead of the big one you can use the adaptor, available at the bottom of this page.