Characters, drawings, etc, that can be transferred to the artwork by rubbing them off the back of the transfer sheet. Best known manufacturer is letraset.
CJ grew up admiring books. His family owned a small bookstore throughout his early childhood, and he would spend weekends flipping through book after book, always sure to read the ones that looked the most interesting. Not much has changed since then, except now some of those interesting books he picks off the shelf were designed by his company!