Teaching time will be much easier using the new Day/Night Teacher™ Overhead Clock Face. You can move the minute hand with either the dial, which is located on the back of the clock, or by using the knob support on the minute hand. The sun and moon wheel turn as the clock hands move in a 12-hour period to illustrate day and night. The minute hand is blue, to match the minute ticks, and the hour hand is orange, to match the hour ticks. Made of SAFE-T Plastic®, the clock faces are 4.5" square and come in a set of 5.