A heavy-duty soft tip disposable pen that writes on glass, metal, ceramics, plastics, paper, etc. The pen operates within the temperature range of 4° to 49° C (-5° to 125° F). The oil-based marking paint resists washing, weathering, mild acids, alkalies, and withstands autoclaving at 121°C (250°F). Mark is approximately 1 mm (0.040") wide. The snap-on cap indicates the color of the ink. Choose from 7 colors.