Makin 's Clay Push Molds are plastic casting molds which can be used for the shaping of small 3D objects. Using these, you can quickly and easily create the desired project. The molds are sized 14x17.5 cms. Instructions: Sprinkle the Makin's Clay Push Mold first with cornstarch then shake the excess cornstarch from the press mold. This will ensure that your clay will not stick to the inside of the mold. Roll a ball of clay which measures slightly smaller than the mold you want to use. Press the clay into the mold. Start in the middle and work from there to the edges of the mold. Check for air bubbles at the front. Make sure you push all the air out of the mold. Then remove the excess clay. To remove the newly formed object from the mold, press gently on the front of the mold until the object releases itself.