200mm diam MDF framed board. A handy smaller circular frame. The edge on our MDF framed boards protrudes 5mm above the surface of the board which is ideal for our glass and ceramic tiles which are 4mm thick.
Please note that the width of the frame edge is 8 mm which means the internal dimensions (the space available for your mosaic) will be 16mm less than the listed frame size so this 200mm diam. board has an internal diameter of 184mm. Just to be clear !!