Stamping Foam blocks are moldable foam pieces that are great for creating original and unique stamps. To use, heat foam with heating tool. Then, press foam into textured surface and hold in place for 5-10 seconds. Ink with ink pads and stamp. The foam can be reheated and remolded to use over and over again. Includes 4 pieces of foam each measuring 3 x 4.25 inches with a 0.78 inch (20 mm) depth.