20cm lampshade with rolled edge and single seam.
All lampshade inner panels have been tested in the Lighting Association Laboratories and have passed the glow wire test which is The British Standard for Luminaries. Any fabrics, textiles or paper that I laminate to the inner panel is fire resistant.
The ring fitting is adjustable for 29mm aperture (UK fitting) or 42mm aperture (European and USA fittings). I would recommend the use of a low energy bulbs (40 watts or less).