Stamping Foam are moldable foam pieces that are great for creating original and unique stamps. To use, heat foam with Heat It Craft Tool. Then, press foam into textured surface and hold in place for 5 to 10 seconds. Ink with Dye Ink Pads and stamp. The foam can be reheated and remolded to use over and over again. Includes 4 pieces of foam each measuring 3x4.25inch with a 20mm depth.