Thin textured black acrylic sheet to use as a work surface when you work with your clay, 180x180mm. It is approximately 1.5mm thick. This one has a gorgeous pinseal look to it, check out image 2 for a closer look. Don't forget to use some sort of release to stop your clay sticking! Spray with CoolSlip, Badger Balm or Slik Baby before placing on the clay to avoid sticking.