CoordiMate Self Inking XY Graph Stamp Clear and Yellow, Metric Measurements (With Black Ink) Functional -Time Saving-Perfect Axes with the push of a button! User friendly - Simple and intuitive Precision Alignment -Engraved guide marks for precision placement Quick Drying - Flash dry non-smear butterfly ink Convenient - 2.5 inches in diameter, 1 inch in height, allowing it to easily fit in most pencil cases Cool Design - CoordiMate is chic, neat, compact and with colorful options to light up your studies Homework Accuracy - Keep those graphs neat! Graphing accurate precise calculations, position your graph, push to stamp! Reliable- Built to last + 5000 clicks loaded and refillable