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