By Provo Craft. Create thousands of combinations in shapes and sizes with a cricut cartridge. Each cartridge comes with a Keypad Overlay, and Idea Book and Resource Guide specific to that cartridge. The book is full of information and detailed images to help you utilize the cartridge to its full potential. The keypad overlay has been designed with easy to identify letters, numbers, symbols and sayings. The cartridge box is sturdily constructed with a magnetic closure to keep your cartridge, overlay and book tidy and easy to store.