Our wall clock is made of premium wood with white letters and numbers. The clock is great for home, classroom, office, etc. As the clock , the hands move around indicating through a different math problem for each hour. A unique and creative way to keep track of time. The perfect present for teachers, students, engineers and accountants or anyone who works with numbers. Features -Color:Black -Material: Wood. -Size: 30.5x30.5cm. - Our wall clock is made of premium wood with white letters and numbers. - As the clock , the hands move around indicating 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 might solve of time. - The clock is great for home, classroom, office, etc. - The perfect present for teachers, students, engineers and accountants or anyone who works with numbers. Package list: 1 x wall clock