The Krizzl kit consists of a transparent case for the iPhone 4/4s or 5/5s, a DIN A5 notepad with 40 sheets of paper and an eco-friendly packaging. The notepad is perforated in the middle, so that the removable sheets exactly fit into the case. The smartphone user – and respectively their friends, children, acquaintances – can colour the pages as they please, put them into the case and then clip it onto the back of the iPhone.