Color: As shown.-Material: Wood.-Size: 30.5x30.5cm.- Our wall clock is made of premium wood with white letters and numbers.- As the clock ticks, the hands move around the dial indicating the time of day through a different math problem for each hour.- A unique and creative way to keep track of time. This wall clock is a fun and challenging brain exercise. Solve it and you might solve the riddle of time.- The clock is great for home, classroom, office, etc.- The perfect gift for teachers, students, engineers and accountants or anyone who works with numbers.