Blockwallah stamps are fair trade stamps. These stamps are treated with oil and are first thoroughly dried for this purpose. All this benefits the quality and the lifespan. With this stamp you have a very special stamp with unique designs and can be used for all kinds of hobbies as well as for clay. Please keep in mind that before use with clay, make sure that you make the stamp moist / wet. This prevents the clay from sticking to the stamp.