Weible Knet Fantasy Clay Block Shape Blue. Packaged as a block in foil. Weight 250 grams - size 110 x 55 x 38mm. Weible Knet has been a high-quality, natural quality product from Germany for more than 100 years. It does not dehydrate and will not harden. This means that the clay can be used for many years without any problems The product is 100% natural and gluten free so there is no risk for children to this clay. Weible Knetis manufactured from potato starch and beeswax, the dyes come from the food industry so the clay is colored exclusively with natural dyes. Weible Knetis the best choice for your child / children.