Sio-2 PLUS is a natural, self-hardening clay that does not require firing. Once dry, the clay becomes solid and highly durable, and can be covered with any kind of paint or varnish. It may also be polished, carved or drilled. Its natural components ensure excellent plasticity, while the presence of natural cellulose fibres allow safe drying, without cracks or fissures, even for large pieces. Cover the modelling clay when not in use.Sio-2 PLUS clay is suitable for use in children ages 3 and up, and promotes the development of their creative and perceptual skills. Sio-2 PLUS clay is also recommended for crafters and professionals in creative arts.