Write & Wipe Clocks Classroom Set, 1 Demonstration Clock, 24 Student ClocksKeep the whole class on time with this set of 24 heavy duty laminated Student Clocks and one 12" x 12" Demonstration Clock. Measuring 4. 5" square, Student Clocks encourage student participation in time telling activities with movable plastic hands and a place to write in the digital time. Large vibrant Demonstration Clock is perfect for classroom demonstration. Recommended age 6+ years