Size: Our set includes a total of twelve depth guides, 152mm long and 25mm wide, two guides for each thickness level (2mm, 3mm, 4mm, and 5mm), such a range of thicknesses allows you to get a very high degree of accuracy. Material: Our pottery tools are made of clear acrylic with a protective film on the surface, not easy to break or deform, the edges of these clay tools are finely cut and polished, they won't scratch your hands. Well-Designed: These clay roller guides are simple and generous in appearance, for ease of use, the thickness is engraved on the surface of the guide, making it easy for you to find the guide you need. Easy to Use: You just need to choose the right thickness, place the clay between the two guides and roll it with the clay roller to get a flat piece of clay. Wide range of uses: These clay depth guides are not only suitable for rolling polymer clay dough, but can also be used for rolling ceramic, pottery dough or any other clay dough.