Cardiac Science ECG Thermal Paper, Z-Fold, 8.5 x 11 is quality recording paper for ECGs and cardiac stress testing units. The HeartLine ECG thermal paper is preprinted with a 5. 91" (150 mm) red matrix grid and perforations with blank headers. Sheets are 8. 5" (216mm) x 11" (279mm) format with 200 sheets per pad. This recording paper is compatible with the following Cardiac Science instruments: Burdick Atria 6100, Burdick Atria 3100, Burdick-Quest Cardiac Stress Test System, Eclipse 850, and Eclipse Premier.