Sargent Art® Modeling Clay is ideal for freehand modeling, claymation, and realistic sculpting. This mineral based clay features consistent color in every stick. Mix colors to create new colors. Non-hardening, pliable, long-lasting, and reusable. Gluten-free, non-toxic, and conforms to ASTM D 4236. Each pack includes 1 lb of clay in 4 color sticks: blue, green, yellow, and red.