Includes 4 stamps, perfectly designed for layering on top of each other, using the CMYK inkpads. CMYK stands for Cyan, Magenta, Yellow and Black. These are the 4 colours used to achieve all the colours that you see in colour photocopiers and printers. Use these 4 colours and layering stamps to create multi-coloured images. Better yet, use the Precision Press to make the stamping a breeze (sold separately).