Material: Acrylic. Size: About 20 x 2 x 2cm/7.9 x 0.8 x 0.8inch(LxWxH). U shape acrylic sheet board: with protective coverings on the surface, against scratch and dust. Essential moulding clay tools: acrylic roller can adjust clay's shape or thickness, acrylic sheet can be used for backing board or pressing clay into other shapes. Made of high quality acrylic, it is durable and long lasting use. Four corners of the U shape board are specially polished, safe to use. Great for changing the shape of clay.