POLYFORM-Firefly Non Dry Modeling Clay. This is a wax-based modeling clay that is easy to work with and won't dry out! It has a soft, smooth texture and naturally sticks to itself, making it simple to create figures and shapes in a full range of vibrant colors. This package contains fifty-two pieces of modeling clay in a variety of colors (2.16 lb of clay). Conforms to ASTM D 4236. Imported.