Self-inking teacher's stamp delivers a red smiling apple with the red word "Excellent!" underneath. Works like a small printing machine. Just press down, and it prints, delivering hundreds of thousands of clear, crisp impressions. Self-inking from built-in stamp pads that contain nontoxic, water-based inks. Cartridge can be easily and cheaply replaced in seconds. Clear index window provides easy identification. Die-plate size is 1-3/16" x 1-3/16".