Dip a piece of the Oyumaru in hot water (approx: 80 degree C) for about 3 to 5 minutes. Take the Oyumaru out of the water with a pair of tongs and wipe it dry with a towel. While it is still soft, press the material you wish to mold into the Oyumaru. If the Oyumaru gets hard while you are working with it, place it back in the water and begin the process again. Allow Oyumaru to cool down, remove your object and your mold is ready for your clay project. Oyumaru is re-usable. 1 box 7 pcs multi color (5/8 x 1/4 x 2 1/4 inches per piece)