The ATP3WH pack contains 3 rolls of thermal paper in the size of 57 x 30 mm, allowing you to print approximately 300 black-and-white photos with your Realipix Pocket P printer or your Realikids Instant Cam instant camera. The ATP3WH paper rolls are also compatible with devices that use thermal printing technology. Thermal printing works without ink; you only need one thermal paper roll to print numerous photos. How does it work? A heating element controls the printing process on the thermal paper. This is the same printing method used for receipts or invoices. It's very easy to use and, with 100 printed images per roll, it is also very cost-effective.