CShell Imprint templates. Presently, the CShell Classic, CShell Ultra, CShell Double, and CShell Square are the only CShell products we are able to print on. The screen printing limitations on the CShell are limited so please read and understand the instructions and parameters. We suggest that no more than two colors be printed on this product and that those colors not rely heavily on precise alignment of one another. Contact our CShell representative if you feel that your choices are not clear.