This mallet percussion self-inking rubber stamp is 2.25 inches wide and available in black ink. Students can be assessed on scales and arpeggios easily by filling in the rectangles on the "bars" with a pencil. The mallet keyboard design is made nice and crisp so that rectangles aren't filled in with ink when stamped. It has enough ink for approximately 5000 imprints and refill ink is available for an additional cost. Great assessment tool for beginners! A popular item for private lesson instructors!